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Popular >

simplify (7-i)(4+2i)

Solution

simplify

(7 - i) (4 + 2 i)

Solution

30 + 10 i

Solution steps

(7 - i) (4 + 2 i)

Apply complex arithmetic rule:

(a + bi) (c + d i) = (a c - b d) + (a d + b c) i

= (7 \cdot 4 - (- 1) \cdot 2) + (7 \cdot 2 - 1 \cdot 4) i

Simplify

(7 \cdot 4 - (- 1) \cdot 2) + (7 \cdot 2 - 1 \cdot 4) i : 30 + 10 i

= 30 + 10 i

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Frequently Asked Questions (FAQ)

What is (7-i)(4+2i) ?
The solution to (7-i)(4+2i) is 30+10i