After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? Check all that apply
a.x^3+x^2+x=0
b.5x+4=3x^2-2
c.-3x^2+9x+3x^2=14+x-1
d.-x^2+4x+7=2x^2-9
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ans (a) x^3+x^2+x= 0
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