Question

Factor the following pro the remaining trinomial. -2r^(2)+4r+30

Answer 1

-2r²+4r+30

b²-4ac= 4²-4(-2*30)=256

Δ=256, √Δ=16

(-b-√Δ)/2a =(-4-16)/-4 = 5

(-b+√Δ)/2a = (-4+16)/-4 = -3

the trinomial admits as factorization −2(x-5)(x+3)