Question

$x {}^ {2} - x - 20 = 0$
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Answer 1

Answer:

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Step-by-step explanation:

$x {}^ {2} - x - 20 = 0 \\ \\ x {}^{2} + 5x - 4x - 20 = 0 \\ \\ x(x + 5) - 4(x + 5) = 0 \\ \\ (x - 4)(x + 5) = 0 \\ \\ (x - 4) = 0 \: \: or \: \: (x + 5) = 0 \\ \\ x = - 4\: \: or \: \: x = 5$