Question

When x = −1, what is the value of the polynomial 2x³ + 2x? 

विकल्प

• 4

• 2

• −2

• −4

Answer 1

−4

Explanation:

Let p(x) = 2x³ + 2x 

∴ p(−1) = 2 × (−1)³ + 2 × (−1)

= 2 × (−1) − 2

= − 2 − 2

= −4

Thus, the value of the polynomial when x = −1 is −4.