Question

solve the following x²-2x-15= 0​

Answer 1

Solution :

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

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

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

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

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

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

Answer 2

Step-by-step explanation:

x²-2x=48x²-2x=48x²-2x=48x²-2x-15= 0