Question

How to factorise 2x²+21-50

Answer 1

2x^2 + 21x - 50
= 2x^2 - 4x + 25x - 50
= 2x ( x-2) + 25(x-2)
= (x-2)(2x+25)

Answer 2

$2 {x}^{2} + 21 - 50 = 0$


$= > 2 {x}^{2} + 25x - 4x - 50 = 0$


$= > x(2x + 25) - 2(2x + 25) = 0$


$= > (x - 2)(2x + 25)$


$= > x = 2 \: \: or \: \: x = \frac{ - 25}{2}$

hope this ans is helpful