Question

the solutions of quadratic equation x2+2x-15=0 are​

Answer 1

Answer:

2x+2x=0+15

4x=15

x=15/4

Answer 2

${x}^{2} + 2x - 15 = 0$

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

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

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

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

$x + 5 = 0$

$x - 3 = 0$

$x = - 5$

$x = 3$