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Simplify the following expression into the form a + bi, where a and b are rational numbers. -2i(7-4i...
4 months ago
Q:
Simplify the following expression into the form a + bi, where a and b are rational numbers. -2i(7-4i)+(3+i)(-2+2i)
Accepted Solution
A:
The answer is -16 - 10i.
Using the distributive property on the first part, we have:
-2i*7--2i*4i + (3+i)(-2+2i)
-14i+8i² +(3+i)(-2+2i)
Using FOIL on the last part,
-14i+8i²+(3*-2+3*2i+i*-2+i*2i)
-14i+8i²-6+6i-2i+2i²
-10i+8i²-6+2i²
Since we know that i = -1,
-10i+8(-1)-6+2(-1)
-10i-8-6-2
-16-10i