Question

Write the product(2+7i)(2-7i) in the form a+bi

Answer 1

Answer:

53

Step-by-step explanation:

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(2 + 7i)(2 - 7i)

(2 * 2) + (2 * -7i) + (7i * 2) + (7i * -7i)

4 + -14i + 14i + $-49i^{2}$

4 + $-49i^{2}$                     ($i^{2}$ = -1)

4 + (-49 * -1)

4 + 49

53.

53 is the result.

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