Question

Y=-3x^2-30x-27 find the zeroes of the function by rewriting the function in intercept form

Answer 1

y=-3x²-30x-27

Δ=b²-4ac=(-30)²-4.(-3).(-27)=900-324=576 ∴ √Δ=24

x'=(-b$+$√Δ)/2a=(-(-30)$+$24)/2.(-3)=-54/6=-9

x''=(-b-√Δ)/2a=(-(-30)-24)/2.(-3)=-6/6=-1

Raízes são x''=-9 e x''=-1