please explain. thank you guys.
(a+b)^2+2(a+b)-2 =
a^2 + 2ab + b^2 + 2a + 2b - 2
Replace a+b with x:
f(a+b) = (a+b)² + 2(a+b) − 2
f(x) = x² + 2x − 2
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(a+b)^2+2(a+b)-2 =
a^2 + 2ab + b^2 + 2a + 2b - 2
Replace a+b with x:
f(a+b) = (a+b)² + 2(a+b) − 2
f(x) = x² + 2x − 2