Question

solve the following

x²-2x-15= 0​

Answer 1

x²-2x-15= 0

= x² + 3x - 5x - 15 = 0

= x( x + 3 ) - 5 ( x + 3)

= ( x + 3 ) ( x - 5)

hope it helps you

Answer 2

Solution :

$\: \: \: \: {x}^{2} - 2x - 15 = 0$

$= > {x}^{2} - 5x + 3x - 15 = 0$

$= > x(x - 5) + 3(x - 5) = 0$

$= > (x - 5)(x + 3) = 0$

$= > x - 5 = 0 \: \: \: \: \: or \: \: \: \: \: x + 3 = 0$

$= > x = 5 \: \: \: \: \: or \: \: \: \: \: x = - 3.$