Question

$2x$
2x square + 5x -168 =0
solve by factorisation method​

Answer 1

Answer:

2x² + 5x - 168 = 0

2x² + 21x - 16x - 168 = 0

x(2x + 21) - 8(2x + 21) = 0

(x - 8) (2x + 21) = 0

So either of them is 0, then only the product is zero.

Equating,

x - 8 = 0

x = 8

Or 2x + 21 = 0

2x = - 21

x = - 21/2

So x = 8 or x = - 21/2

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