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F(x)=2x³+6 and g(x)= -5x+4

Find f(-4) and g(5)​

User Szbalint
by
8.3k points

1 Answer

4 votes

Answer:-


f( - 4) = - 122

And


g(5) = - 21

Explanation:

Greetings !

For the first expression


f(x) = 2x {}^(3) + 6

plug in -4 at the variable x and solve the expression.


f( - 4) = 2( - 4) {}^(3) + 6

Follow the PEMDAS order of operations

calculate the exponents


( - 4) {}^(3) = - 64

Apply exponent rule


( - a) {}^(n) = - a {}^(n) . \: if \: n \: is \: odd

Thus,


( - 4) {}^(3) = - 4 {}^(3) = - 64

Multiply and divide (left to right )


2( - 64) = - 128


= - 128 + 6 \\ = - 122

Fairly follow the same. process for the second function

Hope it helps !!

User Rich Adams
by
7.8k points

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