Question

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(15+2x)(15-2x)
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Answer 1

Answer:

=15²-2x²

=225-4x².

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Answer 2

Answer:

(15+2x)(15-2x)

225-30x+30x-4x^2

225-4x^2

-4x^2+225

(2x+15)(2x-15)

So, 2x = -15  or  2x = 15

     x = -7.5 or x = 7.5

 which are the answers

(I have done more)