Question

Multiply (x-1)(x+2)

Answer 1

x^2 + x - 2

Answer 2

\[(x-1)(x+2)=x\times x + 2\times x \ -1\times x +-1\times 2\]
\[=x^2+2x-x-2\]
\[=x^2+x-2\]

Answer 3

(x-1)(x+2) = x(x+2) -1(x+2) = x^2 + 2x -x -2 = x^2 +x - 2