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Let’s check out your problem:
Solve the equation
2
x
2
+
8
x
−
17
=
0
2 x^{2}+8 x-17=0
2
x
2
+
8
x
−
17
=
0
to the nearest tenth.
\newline
Answer:
x
=
x=
x
=
View step-by-step help
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Math Problems
Algebra 1
Solve linear equations: mixed review
Full solution
Q.
Solve the equation
2
x
2
+
8
x
−
17
=
0
2 x^{2}+8 x-17=0
2
x
2
+
8
x
−
17
=
0
to the nearest tenth.
\newline
Answer:
x
=
x=
x
=
Identify Equation Type:
Identify the type of equation.
\newline
We have a
quadratic equation
in the form
a
x
2
+
b
x
+
c
=
0
ax^2 + bx + c = 0
a
x
2
+
b
x
+
c
=
0
, where
a
=
2
a = 2
a
=
2
,
b
=
8
b = 8
b
=
8
, and
c
=
−
17
c = -17
c
=
−
17
.
Use Quadratic Formula:
Use the
quadratic formula
to solve for
x
x
x
. The quadratic formula is
x
=
−
b
±
b
2
−
4
a
c
2
a
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
x
=
2
a
−
b
±
b
2
−
4
a
c
.
Calculate Discriminant:
Calculate the discriminant
(
b
2
−
4
a
c
)
(b^2 - 4ac)
(
b
2
−
4
a
c
)
. Discriminant =
(
8
)
2
−
4
(
2
)
(
−
17
)
=
64
+
136
=
200
(8)^2 - 4(2)(-17) = 64 + 136 = 200
(
8
)
2
−
4
(
2
)
(
−
17
)
=
64
+
136
=
200
.
Calculate x Values:
Calculate the two possible values for x using the quadratic formula.
\newline
x
=
−
8
±
200
2
×
2
x = \frac{-8 \pm \sqrt{200}}{2 \times 2}
x
=
2
×
2
−
8
±
200
\newline
x
=
−
8
±
200
4
x = \frac{-8 \pm \sqrt{200}}{4}
x
=
4
−
8
±
200
Simplify Square Root:
Simplify the
square root
of the discriminant.
\newline
200
=
(
100
⋅
2
)
=
100
⋅
2
=
10
2
\sqrt{200} = \sqrt{(100 \cdot 2)} = \sqrt{100} \cdot \sqrt{2} = 10\sqrt{2}
200
=
(
100
⋅
2
)
=
100
⋅
2
=
10
2
Substitute Simplified Root:
Substitute the simplified square root back into the formula.
\newline
x
=
−
8
±
10
2
4
x = \frac{{-8 \pm 10\sqrt{2}}}{{4}}
x
=
4
−
8
±
10
2
Calculate Solutions:
Calculate the two solutions for
x
x
x
.
\newline
First solution:
x
=
−
8
+
10
2
4
x = \frac{{-8 + 10\sqrt{2}}}{{4}}
x
=
4
−
8
+
10
2
\newline
Second solution:
x
=
−
8
−
10
2
4
x = \frac{{-8 - 10\sqrt{2}}}{{4}}
x
=
4
−
8
−
10
2
Simplify Solutions:
Simplify both solutions.
\newline
First solution:
x
≈
(
−
8
+
14.14
)
/
4
≈
6.14
/
4
≈
1.5
x \approx (-8 + 14.14) / 4 \approx 6.14 / 4 \approx 1.5
x
≈
(
−
8
+
14.14
)
/4
≈
6.14/4
≈
1.5
(to the nearest tenth)
\newline
Second solution:
x
≈
(
−
8
−
14.14
)
/
4
≈
−
22.14
/
4
≈
−
5.5
x \approx (-8 - 14.14) / 4 \approx -22.14 / 4 \approx -5.5
x
≈
(
−
8
−
14.14
)
/4
≈
−
22.14/4
≈
−
5.5
(to the nearest tenth)
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\newline
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=
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=
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\newline
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\newline
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z
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7
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How many solutions does the following equation have?
\newline
7
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y
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y
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7
(
y
−
8
)
=
7
y
+
42
\newline
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1
1
1
answer:
\newline
(A) No solutions
\newline
(B) Exactly one solution
\newline
(C) Infinitely many solutions
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How many solutions does the following equation have?
\newline
−
9
(
x
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6
)
=
−
9
x
+
108
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−
9
(
x
+
6
)
=
−
9
x
+
108
\newline
Choose
1
1
1
answer:
\newline
(A) No solutions
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(B) Exactly one solution
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(C) Infinitely many solutions
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How many solutions does the following equation have?
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−
6
(
x
+
7
)
=
−
4
x
−
2
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−
6
(
x
+
7
)
=
−
4
x
−
2
\newline
Choose
1
1
1
answer:
\newline
(A) No solutions
\newline
(B) Exactly one solution
\newline
(C) Infinitely many solutions
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Question
How many solutions does the following equation have?
\newline
−
4
x
−
7
+
10
x
=
−
7
+
6
x
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−
4
x
−
7
+
10
x
=
−
7
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6
x
\newline
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1
answer:
\newline
(A) No solutions
\newline
(B) Exactly one solution
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(C) Infinitely many solutions
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Question
How many solutions does the following equation have?
\newline
−
17
(
y
−
2
)
=
−
17
y
+
64
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−
17
(
y
−
2
)
=
−
17
y
+
64
\newline
Choose
1
1
1
answer:
\newline
(A) No solutions
\newline
(B) Exactly one solution
\newline
(C) Infinitely many solutions
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Question
How many solutions does the following equation have?
\newline
9
z
−
6
+
7
z
=
16
z
−
6
9z-6+7z=16z-6
9
z
−
6
+
7
z
=
16
z
−
6
\newline
Choose
1
1
1
answer:
\newline
(A) No solutions
\newline
(B) Exactly one solution
\newline
(C) Infinitely many solutions
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