Question

x square minus 60 x minus 2700

Answer 1

${x}^{2} - 60x - 2700$
${x }^{2} - 90x + 30x - 2700$
x(x-90)+30(x-90)
(x+30)(x-90)
x=90,-30

Answer 2

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By factorising we can solve this :

$= {x}^{2} - 60x - 2700 \\ \\ = {x}^{2} - 90x + 30x - 2700 \\ \\ = x(x - 90) + 30(x - 90) \\ \\ = (x + 30)(x - 90)$

For value of x we have to equate this equal to 0 .

(x + 30)(x - 90) = 0

(x + 30) = 0 ....(x - 90) = 0

x = - 30 & 90

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