Final answer to the problem
$f\left(x\right)=x^2+x-2$
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1
Apply the formula: $\left(x+a\right)\left(x+b\right)$$=x^2+\left(a+b\right)x+ab$, where $a=-1$, $b=2$, $x+b=x+2$ and $x+a=x-1$
$f\left(x\right)=x^2+\left(-1+2\right)x-2$
Learn how to solve expressions algébriques problems step by step online.
$f\left(x\right)=x^2+\left(-1+2\right)x-2$
Learn how to solve expressions algébriques problems step by step online. f(x)=(x-1)(x+2). Apply the formula: \left(x+a\right)\left(x+b\right)=x^2+\left(a+b\right)x+ab, where a=-1, b=2, x+b=x+2 and x+a=x-1. Apply the formula: a+b=a+b, where a=2, b=-1 and a+b=-1+2. Apply the formula: 1x=x.
Final answer to the problem
$f\left(x\right)=x^2+x-2$
