x^2 21x+90 #160; #160; #160; #160; #160; #160; #160; Speittting the middle teram x^2 15x 6x+90 ⇒ #160; x(x 15) 6(x 15) ...

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Quadrilaterals

Solve: x2-21...

Question

Solve:
$x^{2} - 21 x + 90$

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Solution

$x^{2} - 21 x + 90$ Speittting the middle teram
$x^{2} - 15 x - 6 x + 90$
$\Rightarrow x (x - 15) - 6 (x - 15)$
$\Rightarrow (x - 6) (x - 15)$

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