What are the solution(s) to the quadratic equation 40 minus x squared is equal to 0 ?
Answer
A
x is equal to plus or minus 4 square root of 10
B
x is equal to plus or minus 2 square root of 10
C
x is equal to plus or minus 4 square root of 5
D
x is equal to plus or minus 2 square root of 5
Explanation
Set 40 − x² equal to 0 and rearrange to get x² = 40. Taking both square roots gives x = ±√40 = ±2√10, so the solution is “x is equal to plus or minus 2 square root of 10.”
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