What is the standard form of $y= (x + 9)(x – 1)$ ?

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Answer 1 · 2015-11-29T14:56:56

$y=x^2+8x-9$

$y=x(x-1)+9(x-1)$ It is distributive!

$y=color(brown)((x xx x)) +color(blue)((x xx{ -1})) +color(red)((9xx x))+color(green)((9xx{-1}))$

$y=color(brown)(x^2)color(blue)(-x)color(red)(+9x)color(green)(-9)$

$y=x^2+8x-9$

What is the standard form of y= (x + 9)(x – 1) y= (x + 9)(x – 1) ?