Question

factorise of x2-8x-1280

Answer 1

Hey mate, here is your answer -:)

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${x}^{2} - 8x - 1280 \\ {x}^{2} - (40 - 32)x - 1280 \\ {x}^{2} - 40x + 32x - 1280 \\ x(x - 40) + 32( x - 40) \\ (x + 32)(x - 40)$
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HOPE it helps to you!!!

Answer 2

$\underline{\bold{Solution:-}}$

${x}^{2} - 8x - 1280 = 0$
${x}^{2} - (40 - 32)x - 1280 = 0 \\ \\ {x}^{2} - 40x + 32x - 1280 = 0 \\ \\ \bold{Taking \: common} \\ \\ x(x - 40) + 32(x - 40) = 0 \\ \\ \boxed{(x + 32)(x - 40) = 0} \\ \\ If \: x + 32 = 0 \\ \\\boxed{ x = - 32} \\ \\ if \: x - 40 = 0 \\ \\ \boxed{x = 40}$