Question

84. Resolve into factors
4xsquare - 4x -15​

Answer 1

,

$4 {x}^{2} - 4x - 15 \\ sum = - 4 \: \: product = 4 \times - 15 = - 60 \\ numbers \: are \: \: - 10and6 \\ 4 {x }^{2} - 10x + 6x - 15 \\ = 2x(2x - 5) + 3(2x + 5) \\ = (2x + 5)(2x + 3)$this is the required answer

(2x+5)(2x+3)