Question

if two zeroes of polynomial x³+5x²+7x+3 are -1 and -3, then find the third zero.

Answer 1

Let the third zero = p

sum of zeroes = -b/a
(-3) + (-1) + p = -5/1
-4 + p = -5
p = -5 + 4
p = -1

∴ third zero is -1

Answer 2

Answer:

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Step-by-step explanation:

Let the third zero = x sum of zeroes

= -b/a (-3) + (-1) + x

= -5/1 -4 + x = -5

x = -5 + 4

x = -1