Find the zeros of the polynomial function.
f(x) = x3 + x2 - 42x
zeros of the function are where the value of function is zero.
x3 + x2 - 42x=0
Hence, x=0 or x2+x-42=0
x(x-7)+6(x-7)=0, thus (x+6)(x-7)=0
so, x= -6 or x=7
Hence the zeros of the function are at x=0, -6, 7
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