Question

the value of the polynomial 7x^4+3x^2-4 ,when x=-2 is​

Answer 1

Answer:

120 is the answer :)

Step-by-step explanation:

Answer 2

Given:

P(x)=7x^4+3x^2-4

x= -2

To find:

The value of the polynomial

Solution:

The polynomial's required value is 120.

We will have to put x= -2 in the given polynomial to obtain the required value.

The polynomial, P(x)=7x^4+3x^2-4

We will put x= -2 and get P(-2).

So, using the value of x, we get

P(-2)=7×$(-2)^{4}$+3×$(-2)^{2}$-4

On multiplying and subtracting,

P(-2)=7×16+3×4-4

P(-2)=112+12-4

P(-2)=120

Therefore, the polynomial's required value is 120.