Question

Is 3 a zero of polynomial x2+2x-5 Give reason​

Answer 1

Answer:

No

Step-by-step explanation:

x² + 2x - 5 = 0.

x = 3

3² + 2 ( 3 ) - 5 = 0

9 + 6 - 5 = 0

9 + 1 = 0

10 ≠ 0

Therefore, 3 is not a zero of polynomial x² + 2x - 5 = 0.

Answer 2

Answer:

3 is not a zero of polynomial x²+2x-5.

Step-by-step explanation:

Let p(x) = x²+2x-5

If 3 is a zero of p(x) then,

p(3) = 0

So, p(3) = (3)²+2×3-5

= 9+6-5 = 10 ≠ 0

So, p(3) ≠ 0

Therefore, 3 is not a zero of polynomial x²+2x-5.

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