Question

Solve it for 50 points.

Answer 1

(1+20a)(1-10a)=1-10a+20a-200a2=1a(1-10a)+20(1-10a)

=(1a+20) and (1-10a)

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Answer 2

(1 + 20a) (1 - 10a) = 1 + 10a

=1-10a+20a-200a^2 = 1 + 10a

=10a+20a-200a^2 = 10a

=10a-200a^2 = 10a

=-200a^2 = 10a-10a

=-200a^2 = 0

=a^2 = 0÷(-200)

=a^2 = 0.

here's your answer..