Question

3. Find the value of the polynomial 5x – 4x2 + 3 at x = 2 and x = -1
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Answer 1

1. write the equation similarly what is in the question
2. first substitute x=2 like this 5(2)-4(2)2+3=10-16+3=-3
3. second substitute -1 like this 5(-1)-4(-1)2+3=-5-4+3=-6

Answer 2

Answer:

Given:

⇒ Find the value of the polynomial: 5x - 4x² + 3 at x = 2 and x = - 1.

Calculations:

⇒ Equation: 5x – 4x2 + 3

First for (x = 2):

⇒ $\sf 5(2) k - 4 (2)^2 + 3$

⇒ ${\sf{\underline{\boxed{\green{\sf{ 10 - 16 + 3 = -3}}}}}}$

Similarly, for (x = -1):

⇒ $\sf 5(-1) - 4(-1)^2 + 3$

⇒ ${\sf{\underline{\boxed{\green{\sf{-5 -4 + 3 = -6 }}}}}}$

Therefore we got our answers: