06-12-2016
Mathematics

contestada

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

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FrederikSantAna FrederikSantAna

06-12-2016

y=-3x²-30x-27

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

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

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

Raízes são x''=-9 e x''=-1

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