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Popular >

simplify (7i)(-3i)

Solution

simplify

(7 i) (- 3 i)

Solution

21

Solution steps

(7 i) (- 3 i)

Apply rule:

a (- b) = - ab

(7 i) (- 3 i) = - 7 i 3 i

= - 7 i 3 i

Multiply the numbers:

- 7 \cdot 3 = - 21

= - 21 ii

Apply exponent rule:

aa = a^{2}

ii = i^{2}

= - 21 i^{2}

Apply imaginary number rule:

i^{2} = - 1

= - 21 (- 1)

Multiply the numbers:

- 21 (- 1) = 21

= 21

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Frequently Asked Questions (FAQ)

What is (7i)(-3i) ?
The solution to (7i)(-3i) is 21