The sum of zeroes of x square+7x+12 is
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-7
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x^2+7x+12=0
x^2 + x (4+3) +12=0
x^2 +4x +3x +12=0
x(x+4) +3 (x+4)=0
(x+3) (x+4)=0
x= - 3 or x = -4
zeroes of polynomial = -3 , -4
sum of zeroes = -7 = -b/a = -7/1 = -7
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