How do you multiply $(2x - 5)(x - 9)$ ?

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Answer 1 · 2015-08-16T08:13:42

$=2x^2-23x+45$

$color(blue)((2x−5))(x−9)$

$=color(blue)((2x)) * (x) +color(blue)((2x)) * (-9) +color(blue)((-5)) *(x)−color(blue)((5)).(-9)$

$=2x^2 -18x-5x+45$

$=2x^2-23x+45$

How do you multiply (2x - 5)(x - 9)(2x - 5)(x - 9)?