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Multiply and simplify the following complex numbers:
\newline
(
−
3
+
3
i
)
⋅
(
3
−
2
i
)
(-3+3 i) \cdot(3-2 i)
(
−
3
+
3
i
)
⋅
(
3
−
2
i
)
\newline
+
=
−
+\stackrel{-}{=}
+
=
−
View step-by-step help
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Math Problems
Algebra 1
Simplify linear expressions using properties
Full solution
Q.
Multiply and simplify the following complex numbers:
\newline
(
−
3
+
3
i
)
⋅
(
3
−
2
i
)
(-3+3 i) \cdot(3-2 i)
(
−
3
+
3
i
)
⋅
(
3
−
2
i
)
\newline
+
=
−
+\stackrel{-}{=}
+
=
−
Apply distributive property:
Apply the
distributive property
to multiply the two complex numbers.
\newline
(
−
3
+
3
i
)
∗
(
3
−
2
i
)
=
(
−
3
×
3
)
+
(
−
3
×
−
2
i
)
+
(
3
i
×
3
)
+
(
3
i
×
−
2
i
)
(-3+3i)*(3-2i) = (-3 \times 3) + (-3 \times -2i) + (3i \times 3) + (3i \times -2i)
(
−
3
+
3
i
)
∗
(
3
−
2
i
)
=
(
−
3
×
3
)
+
(
−
3
×
−
2
i
)
+
(
3
i
×
3
)
+
(
3
i
×
−
2
i
)
Calculate multiplications:
Calculate each multiplication separately.
\newline
(
−
3
×
3
)
=
−
9
(-3 \times 3) = -9
(
−
3
×
3
)
=
−
9
\newline
(
−
3
×
−
2
i
)
=
6
i
(-3 \times -2i) = 6i
(
−
3
×
−
2
i
)
=
6
i
\newline
(
3
i
×
3
)
=
9
i
(3i \times 3) = 9i
(
3
i
×
3
)
=
9
i
\newline
(
3
i
×
−
2
i
)
=
−
6
i
2
(3i \times -2i) = -6i^2
(
3
i
×
−
2
i
)
=
−
6
i
2
Combine like terms:
Combine like terms and remember that
i
2
=
−
1
i^2 = -1
i
2
=
−
1
.
\newline
−
9
+
6
i
+
9
i
−
6
(
−
1
)
-9 + 6i + 9i - 6(-1)
−
9
+
6
i
+
9
i
−
6
(
−
1
)
Simplify expression:
Simplify the expression by adding real parts and imaginary parts separately and substituting
i
2
i^2
i
2
with
−
1
-1
−
1
.
\newline
−
9
+
6
i
+
9
i
+
6
-9 + 6i + 9i + 6
−
9
+
6
i
+
9
i
+
6
Combine real and imaginary parts:
Combine the real numbers and the imaginary numbers.
(
−
9
+
6
)
+
(
6
i
+
9
i
)
(-9 + 6) + (6i + 9i)
(
−
9
+
6
)
+
(
6
i
+
9
i
)
Finish simplification:
Finish the simplification.
\newline
−
3
+
15
i
-3 + 15i
−
3
+
15
i
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