Question

Given that f(x) = x²+3 find x when f(x)=54 ​

Answer 1

Explanation:

In the place of f(x) plug in 54 and then simplify the eqaution.

[tex]54 = {x}^{2} + 3\\ {x}^{2} + 3 = 54 \\ {x}^{2} + 3 - 54 = 0 \\ \\ {x}^{2} -51 =0

{x}^{2}=51

x=(+-) the square root of 51