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Answered

The square root of the sum of a number and 21 is 3 more than the square root of the number. What is the number?

Sagot :

Beatrixchua2go

Answer:

4

Step-by-step explanation:

√x + 21 = 3 + √x

x+21 = 9 + 6√x + x

21 = 9 + 6√x

-6√x = 9-21

-6√x = -12

√x = 2 (square both sides para macancel yung radical)

x = 4

checking:

√x+21 = 3+√x

√4+21 = 3+√4

√25 = 3+2

5=5

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