7. If x² + 4 = 29, then x² - 4 = ? A. 5 B. √21 C. 21 D. 25 E. 33

Thangchung asked Jan 16, 2023

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3 votes

7. If x² + 4 = 29, then x² - 4 = ?
A. 5
B. √21
C. 21
D. 25
E. 33

Thangchung asked Jan 16, 2023

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14 votes

Answer:

Explanation:

So if x²+4=29 we need to find the value of x

ie. x²=29-4

x²=25

x=√25=±5

Plugging this into the equation it becomes

5²+4=29

now x²-4=5²-4=21

Joe Harris answered Jan 22, 2023

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