Question

find value of Polynomial 2x3 + 2x when x =-1​

Answer 1

Let us assume x = -1

2(-1)³ + 2(-1)

-2 -2

-4.


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Answer 2

Given:

A polynomial 2x³ + 2x.

To Find:

The value of the polynomial at x = -1.

Solution:

The given problem can be solved using direct substitution.

1. The given polynomial is f(x) = 2x³ + 2x.

2. Substitute the value x = -1 to get the value of the polynomial at x = -1,

=> f(x) = 2x³ + 2x,

=> f(-1) = 2(-1)³ + 2(-1),

=> f(-1) = 2(-1) + (-2),

=> f(-1) = -2 -2 ,

=> f(-1) = -4.

3. Value of the polynomial at x = -1 is -4.

Therefore, the value of the polynomial 2x³ + 2x at x = -1 is -4.