To solve for x, we need to isolate the variable on one side of the equation.
3x^2 + 4 = 40
Subtract 4 from both sides:
3x^2 = 36
Divide both sides by 3:
x^2 = 12
Take the square root of both sides:
x = ±√12
Simplify:
x = ±2√3
Therefore, there are two possible values of x: x = 2√3 and x = -2√3.