2 years ago

Help pls I will give brainliest :3

Mathematics

2 answers:

bekas [8.4K]2 years ago

8 0

Answer:

4.2 and 4.3

Step-by-step explanation:

tangare [24]2 years ago

8 0

4.4 and 4.5.
This is because the square root of 20 is actually 4.472135955. Therefore, it is between 4.4 and 4.5

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If the square of twice a number is 81, what is the number? I tried doing 2x^2=81 but that did not come out to the answer 4.5,-4.

Vlada [557]

If the number is n then

square of 2 times a number
square of 2n
(2n)²
that was your mistake, because (2n)²=4n², not 2n²

the result is 81
(2n)²=81
square root both sides
remember positive and negative roots
2n=+/-9
divide by 2
n=+/-4.5

n=4.5 or -4.5

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Step-by-step explanation:

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