Question

(d) If f ( x ) =x^4 + x^2 + 4 then find f ( 8 ) + f ( 3 ) .

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Answer 1

f(8)=8⁴+8²+4

=4164

f(3)=3⁴+3²+4

=94

f(8)+f(3)=4258

Answer 2

Explanation:

$f(8) = {8}^{4} + {8}^{2} + 4 \\ \\ f(3) = {3}^{4} + {3}^{2} + 4 \\ \\ \\ adding \: both \: \: .......... \\ \\ {8}^{4} + {8}^{2} + 4 + {3}^{4} + {3}^{2} + 4 \\ \\ = {8}^{2} ( {8}^{2} + 1) + {3}^{2} ( {3}^{2} + 1) + 8 \\ \\ = (64)(65) + (9)(10) + 8\\ \\ = 4160 + 90 + 8 \\ \\ = 4258$

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