Solve the formula for x.
V=2πrx+6πr2

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kyleeeeee94

31.05.2020

Mathematics

A. 81

Step-by-step explanation:

A perfect square is an integer that is a square of an integer . It is a product of number with itself .

If y=x^2 , y is a perfect square number .

If we write $y=x\times x\times x\times x\times x\times x$

such that $y=x^2\times x^2\times x^2$ .

$\sqrt{y}=\sqrt{x^2\times x^2\times x^2}=x\times x\times x=x^3$ .

A. 81

$81=3\times 3\times 3\times 3=9\times 9=9^2$

So, 81 is a perfect square number .

B. 99

$99=3^2\times 11$

As 99 can not be expressed as a square of an integer . So, it's not a perfect square number .

C. 110

$110=2\times 5\times 11$

As 110 can not be expressed as a square of an integer . So, it's not a perfect square number .

D. 120

$120=2^2\times 2\times 3\times 5$

As 120 can not be expressed as a square of an integer . So, it's not a perfect square number .

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Solve the formula for x. V=2πrx+6πr2