Question

identity of (x+b)²
identity of (x-b)²

Answer 1

HI !

(a+b)² = a² + 2ab + b²

so , (x+b)² = x² + 2xb + b²
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(a-b)² = a² - 2ab + b²

so , (x-b)² = x² - 2xb + b²

Answer 2

Hey there!
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(x+b)²

=(x+b)(x+b)

=x(x+b)+b(x+b)

=x²+bx+bx+b²

=x²+b²+2bx

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(x-b)²

=(x-b)(x-b)

= x(x-b)-b(x-b)

=x²-bx-bx+b²

=x²+b²-2bx
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You can use

(a+b)²=a²+b²+2ab

(a-b)²=a²+b²-2ab
hope helped !