If f(x) = x² − 2, then f(x + h) = ?
Substitute (x + h), in for x, into f(x) = x²  2
f(x + h) = (x + h)²  2 {substituted (x + h) in for x} = (x + h)(x + h)  2 {squared the binomial} = x² + 2xh + h²  2 {used distributive property / FOIL method} Ask Algebra House
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