Find the coefficient of x2
in x. (x- 7). (3 x + 5)
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in a cubic polynomial sum of zeroes is -b/a
where a is coeff of x³
coeff of x³ is 3x(x) (x) =3x³
a=3
sum of zeroes=0+7+(-5/3)
16/3
16/3=-b/3
b=-16
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