Question

if 3 is a polynomial x^2 + 2x - a then find the values of a​

Answer 1

Answer:

x = 3

x²+2x-a = 0

3² + 2(3) - a = 0

9+6-a = 0

15-a = a

a = 15

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Answer 2

Answer:

Step-by-step explanation:

Just use f(x) to solve the problem....As 3 is a root of the polynomial,if we replce x by 3,then obviously,the remainder will be 0 (according to remainder theorem).