4. Obtain all zeros of f(x) = x3 + 13x2 + 32x + 20, if one of its zeros is – 2.
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f(x) = x3 + 13x2 + 32x + 20, if one of its zeros is – 2.
f(-2)= -2×3+ 26 + 32×(-2) +20
f(-2)= -6+ 26 -64+20
f(-2)= -24
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