3 years ago

Find the exact solution of 3x^2+7=28

1 answer:

4 0

$\text{Solve:}\\\\3x^2+7=28\\\\\text{Subtract 7 from both sides}\\\\3x^2=21\\\\\text{Divide both sides by 3}\\\\x^2=7\\\\\text{Square root both sides}\\\\\sqrt{x^2}=\sqrt7\\\\x=\pm\sqrt7\\\\\boxed{x=\sqrt7\,\,or\,\,x=-\sqrt7}$

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Step-by-step explanation:

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3 years ago

Circle A has an area of 452.16ft2. With a radius of 12 ft. If circle B has a radius of 17 ft, what is it’s area?

ehidna [41]

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Step-by-step explanation:

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3 years ago

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seraphim [82]

Answer:

To solve for n you need to get it by itself

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Now you want to combine any like terms if possible

4n+28=-20 (-2n+6n=4n, both like terms)

Then you want to subtract -28 from both sides

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3 years ago

What is the approximate volume of the sphere

NISA [10]

Answer:

523.33 mm³

Step-by-step explanation:

The general formula for the volume of a sphere is:

V = $\frac{4}{3}\pi r^{3}$

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4 years ago

Plz help..............

IrinaVladis [17]

The correct answer is -15 because the absolute value is 15 but there is a negative outside the absolute value lines making it negative :)

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3 years ago

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