-2(v+1)(v+4)-(v-5)(v+5)

Question

-2(v+1)(v+4)-(v-5)(v+5)

Answer 1

-2(v+1)(v+4)-(v-5)(v+5)
-(2v+2)*(v+4)-(v-5)*(v+5)
-(2v^2+10v+8)-(v-5)*(v+5)
-2v^2-10v-8-(v-5)*(v+5)
-2v^2-10v-8-(v^2-25)
-2v^2-10v-8-v^2+25
-3v^2-10v-8+25
-3v^2-10v+17

D=(-10)^2-4*(-3)*17=100+204=304

v1=V304/6-(5/3) (~-4.57259929569379)
v2=V304/6-(5/3) (~1.23926596236045)