Question

solve 2x^2+4x-240 by factorisation method

Answer 1

2x²+4x-240=0

2x²+24x-20x-240=0

2x(x+12)-20(x+12)=0

(2x-20)(x+12)=0

2x=20 or x=-12

x=10 or -12

Answer 2

Answer:

$given \: polynomial \: = \\ \\ 2 {x}^{2} + 4x - 240 \: \: = 0$

Taking 2 common

${x}^{2} + 2x - 120 \: = 0$

By mid term splitting.

${x}^{2} + 12x - 10x - 120 = 0$

$x(x + 12) - 10(x + 12)$

$(x - 10)(x + 12) = 0 \\ \\ x = 10 \\ \\ x = - 12$

Hope it may help you