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Let’s check out your problem:
x
2
−
10
x
+
14
=
0
x^{2}-10x+14=0
x
2
−
10
x
+
14
=
0
\newline
One solution to the given equation can be written as
x
=
5
+
n
x=5+\sqrt{n}
x
=
5
+
n
, where
n
n
n
is a constant. What is the value of
n
n
n
?
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Math Problems
Precalculus
Find the roots of factored polynomials
Full solution
Q.
x
2
−
10
x
+
14
=
0
x^{2}-10x+14=0
x
2
−
10
x
+
14
=
0
\newline
One solution to the given equation can be written as
x
=
5
+
n
x=5+\sqrt{n}
x
=
5
+
n
, where
n
n
n
is a constant. What is the value of
n
n
n
?
Square x expression:
To find the value of
n
n
n
, we need to use the given solution form
x
=
5
+
n
x = 5 + \sqrt{n}
x
=
5
+
n
and plug it into the
quadratic equation
x
2
−
10
x
+
14
=
0
x^2 - 10x + 14 = 0
x
2
−
10
x
+
14
=
0
.
Simplify squared expression:
First, let's square the expression for
x
x
x
:
(
5
+
n
)
2
=
5
2
+
2
×
5
×
n
+
(
n
)
2
(5 + \sqrt{n})^2 = 5^2 + 2 \times 5 \times \sqrt{n} + (\sqrt{n})^2
(
5
+
n
)
2
=
5
2
+
2
×
5
×
n
+
(
n
)
2
.
Substitute
x
x
x
into equation:
Simplifying the squared expression gives us:
25
+
10
n
+
n
25 + 10\sqrt{n} + n
25
+
10
n
+
n
.
Combine like terms:
Now, we substitute
x
=
5
+
n
x = 5 + \sqrt{n}
x
=
5
+
n
into the quadratic equation:
(
5
+
n
)
2
−
10
(
5
+
n
)
+
14
=
0
(5 + \sqrt{n})^2 - 10(5 + \sqrt{n}) + 14 = 0
(
5
+
n
)
2
−
10
(
5
+
n
)
+
14
=
0
.
Further simplification:
Substitute the simplified squared expression into the equation:
25
+
10
n
+
n
−
10
(
5
)
−
10
n
+
14
=
0
25 + 10\sqrt{n} + n - 10(5) - 10\sqrt{n} + 14 = 0
25
+
10
n
+
n
−
10
(
5
)
−
10
n
+
14
=
0
.
Solve for n:
Simplify the equation by combining like terms:
25
+
n
−
50
+
14
=
0
25 + n - 50 + 14 = 0
25
+
n
−
50
+
14
=
0
.
Solve for n:
Simplify the equation by combining like terms:
25
+
n
−
50
+
14
=
0
25 + n - 50 + 14 = 0
25
+
n
−
50
+
14
=
0
.Further simplification gives us:
n
−
11
=
0
n - 11 = 0
n
−
11
=
0
.
Solve for n:
Simplify the equation by combining like terms:
25
+
n
−
50
+
14
=
0
25 + n - 50 + 14 = 0
25
+
n
−
50
+
14
=
0
.Further simplification gives us:
n
−
11
=
0
n - 11 = 0
n
−
11
=
0
.Solve for n:
n
=
11
n = 11
n
=
11
.
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