45. The zeros of the polynomial f (x) =x cube_5xsquare_16x+80, if it's two zeros are equal in magnitude but opposite in sign are

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Find zeros of f(x)= x³ - 5x² - 16x + 80 , if it’s two zeros are equal in magnitude but opposite in sign

f (x) = x^{3} - 5 x^{2} - 16 x + 80

(x^{3} - 5 x^{2} - 16 x + 80)

p (x) = x^{3} - 5 x^{2} - 16 x + 80

If both the zeroes of a quadratic polynomial ax²+bx+c are equal and opposite in sign, find b.

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