Question

factorie 4x² - 2x - 20

Answer 1

$4{x}^{2} - 2x - 20 \\ 4 { x}^{2} - 10x + 8x - 20 \\ 2x(2x - 5) + 4(2x - 5) \\ (2x + 4)(2x - 5)$
Hope it helps

Answer 2

4x2-2x-20=0
=>4x2-10x+8x-20=0
=>2x(2x-5)+4(2x-5)=0
=>(2x-5)(2x+4)=0
=>2x-5=0 or =>2x+4=0
=>x=5/2 =>x=-2 (Answer)