Question

Completely factor each of the given polynomials. If a polynomial cannot be factored, write "not factorable."

Answer 1

4x^2+23x+15=0
Δ=23^2-4*4*15=529-240=289

x1= (-23+17)/8=-6/8= -3/4
x2= (-23-17)/8=-5

4x^2+23x+15= 4(x+3/4)(x+5)=(4x+3)(x+5)