Question

solve following quadratic equation x^2 + 8 x + 15 =0​

Answer 1

$\huge \tt {x}^{2} + 8x + 15 = 0 \\ \\ \huge \sf {x}^{2} + 3x + 5x + 15 = 0\\ \\ \huge \tt x(x + 3) + 5(x + 3) = 0 \\ \\ \huge \tt(x + 3)(x + 5) = 0 \\ \\ \sf\therefore \: \: x = - 3 \: \: \: \: \: \& \: \: \: \: \: - 5$

Answer 2

Solution :-

x² - 8x + 15 = 0

x² - 5x - 3x + 15 = 0

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

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

x = 3 , 5

hope it helps you !!!