Answer:
x = -4 and x = 4
Step-by-step 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
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
