Question

Answer this question ​

Answer 1

c) 120

Explanation:

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

f(-2) = 7(-2)^4 + 3(-2)^2 - 4 = 7(16) + 3(4) - 4 = 112 + 12 - 4 = 120

Answer 2

120

Explanation:

Given,

x = -2

Now, let's solve

`{7x}^(4) + 3 {x}^(2) - 4`

Plug the value of x

`= 7 * {( - 2)}^(4) + 3 * {( - 2)}^(2) - 4`

A negative base raised to an even power equals a positive

`= 7 * {2}^(4) + 3 * {2}^(2) - 4`

Evaluate the power

`= 7 * 16 + 3 * 4 - 4`

Multiply the numbers

`= 112 + 12 - 4`

Add the numbers

`= 124 - 4`

Subtract the numbers

`= 120`

Hope this helps ...

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