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What is the value of x, when c² + 5 = 21?

User Jmathewt
by
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2 Answers

4 votes

Answer:

Explanation:

What is the value of x, when c² + 5 = 21?

there is no x, assuming you are looking for c

c^2 + 5 = 21

c^2 = 21 - 5

c^2 = 16

c = √16

c = 4

User Erko
by
7.5k points
3 votes

Answer:

x = -4 and x = 4

Explanation:

im assuming you meant x^2 + 5 = 21

1. subtract 5 from both sides

x^2 = 21 - 5 = 16

2. isolate x by taking the square root of both sides

sqrt(x^2) = sqrt(16)

x = ±4

User DroidNinja
by
8.1k points

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