Question

$x {}^{2} - \: 2x \: \: - \: 8$
Obtain the zeroes

Answer 1

HOLA

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$x {}^{2} \: - \: 2x \: - \: 8 \\ \\ x {}^{2} \: - \: 2x \: - \: 4x \: - \: 8 \\ \\ x \: ( \: x \: + \: 2 \: ) \: + \: 4 \: ( \: x \: + \: 2 \: ) \\ \\ ( \: x \: + \: 2 \: ) \: + \: ( \: x \: + \: 4 \: ) \\ \\ \\ x \: = \: 2 \: \: \: x \: = \: 4$
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Zeroes are 2 ,4

HOPE U UNDERSTAND ☺☺

Answer 2

Hey!!

$\\ x {}^{2} - 2x - 8 \\ \\ = x {}^{2} + 2x - 4x - 8 \\ \\ = > x(x + 2) -4(x + 2) \\ \\ = > (x + 2) = 0 \: \: or \: \: (x - 4) = 0 \\ \\ = > x = - 2 \: \: or \: \: x = 4$

Therefore zeroes are - 2 and 4
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Hope it helps ☺☺