Question

The value of the polynomial 7x4 + 3x2 – 4, when x = – 2 is:

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Answer 1

Answer:

The Value of the polynomial is 120.

Step-by-step explanation:

At X=-2

7(-2)⁴ + 3(-2)² - 4

7(16)+3(4)-4

112+12

124-4

120..

Hence the Answer is 120

Answer 2

The value of the polynomial = 120

Given :

The polynomial 7x⁴ + 3x² - 4

To find :

The value of the polynomial at x = - 2

Solution :

Step 1 of 2 :

Write down the given polynomial

The given polynomial is 7x⁴ + 3x² - 4

Step 2 of 2 :

Find the value of the polynomial

Putting x = - 2 in 7x⁴ + 3x² - 4 we get

$\sf 7 \times {( - 2)}^{4} + 3 \times {( - 2)}^{2} - 4$

$\sf = (7 \times 16) + (3 \times 4) - 4$

$\sf = 112 + 12 - 4$

$\sf = 112 + 8$

$\sf = 120$