Mathematics: Evaluate each expression for x = 4 and give answers in simplest form. show your work

Evaluate each expression for x = 4 and give answers

jennycrapson

08.01.2022

a) $6x^{-2} = \frac{3}{8}$

b) $5x^{-3} = \frac{5}{64}$

Step-by-step explanation:

The value given for x is 4

1) The given expression is : $6x^{-2}$

By solving the negative exponent, we get $6x^{-2} = \frac{6}{x^{2} }$

Here, substitute x =4, $\frac{6}{x^{2} } = \frac{6}{4 \times 4 } = \frac{6}{16}$

or, $6x^{-2} = \frac{3}{8}$

2) The given expression is : $5x^{-3}$

By solving the negative exponent, we get $5x^{-3} = \frac{5}{x^{3} }$

Here, substitute x =4, $\frac{5}{x^{3} } = \frac{5}{4 \times 4 \times 4 } = \frac{5}{64}$

or, $5x^{-3} = \frac{5}{64}$

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shwubblz

05.07.2020

thank you

Step-by-step explanation:

you guys/girls/ect. that do this are so nice it just makes my day

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