Question

Factorise:x2-9x+20 please give with explanption​

Answer 1

$x {}^{2} - 9x + 20 = 0$

$x {}^{2} - 4x - 5x + 20 = 0$

$x(x - 4) - 5(x - 4) = 0$

$(x - 4)(x - 5) = 0$

$x = 4 \: or \: x = 5$

Answer 2

${x}^{2} -9x+20 \\ = {x}^{2} - 5x - 4x + 20 \\ = x(x - 5) \: - 4(x - 5) \\ = (x - 5) \: \: (x - 4)$

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