Question

Simplify the expression to a + bi form: (-7+5i) (5 + 3i)

Answer 1

Answer:

We know that, i = √-1 => i² = -1

$→( - 7 + 5i)(5 + 3i) \\ = - 35 - 21i + 25i + 15 {i}^{2} \\ = - 35 - 21i + 25i - 15 \\ = \boxed{- 50 + 4i}✓$

• -50 + 4i is the right answer.

Answer 2

Answer:

-50+4i

Step-by-step explanation:

(-7+5i)(5+3i)

-35+25i-21i+15i^2 where i^2=-1

-35+4i+15(-1)

-35-15+4i

-50+4i

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