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2 years ago

A rectangle has a length of 5x - 15 and a length of 2x + 7. What is the area of the rectangle?

Mathematics

1 answer:

Sergeu [11.5K]2 years ago

3 0

2(5x-15) + 2(2x+7) =0
10x-30+4x+14 = 0
14x = 16
x = 8/7

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4^-2 x 7^-2 equivalent expression

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Answer:

Not sure exactly which equivalent expression you are looking for but my goal would be to write it without the negative exponent.

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Step-by-step explanation:

They have the same exponent and it is multiplication.

There is a law of exponent that says $(a \cdot b)^x=a^x \cdot b^x$ .

So we have $4^{-2} \cdot 7^{-2}$ equals $(4 \cdot 7)^{-2}$ .

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Some people really hate that negative exponent. All that - in the exponent means is reciprocal. So $28^{-2}=\frac{1}{28^2}$ .

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Step-by-step explanation:

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Have a nice day!

I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

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3 years ago

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2 years ago

A rectangle has a length of 5x - 15 and a length of 2x + 7. What is the area of the rectangle?​

A rectangle has a length of 5x - 15 and a length of 2x + 7. What is the area of the rectangle?