Question

The value f the polynomial 7x⁴+3x²-4when x=-2 is

Answer 1

Step-by-step explanation:

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

= 7( 16) + 3(4) - 4

= 112 + 12 - 4

= 112 + 8

= 120

i hope this is correct...........

Answer 2

GIVEN,

$polynomial = 7x ^{4} + 3x ^{2} - 4 \\ where \: \: x = - 2$

TO FIND,

$value \: of \: polynomial$

SOLUTION,

$= > p(x) = 7x ^{4} + 3x ^{2} - 4 \\ \\ = > p( - 2) = 7 \times ( - 2) ^{4} + 3 \times ( - 2) ^{2} - 4 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 7 \times 16 + 3 \times 4 - 4 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 112 + 12 - 4 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 124 - 4 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 120$

Therefore the value of polynomial is 120.

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