Question

Find the number of real number solution of 4x^2+16x+15=0?

Answer 1

Factor
4x^2+10x+6x+15 = 0
2x(2x+5) + 3(2x+5) = 0
(2x+5)(2x+3) = 0
x = -5/2 or x = -3/2

Answer 2

\[4x^2+10x+6x+15=0\]\[=>2x(2x+5)+3(2x+5)\]\[(2x+3)(2x+5)\]

Answer 3

\[x=\frac{-5}{2} or \frac{-3}{2}\]

Answer 4

Is that clear now???