6+3x(x)=45

Solution for 6+3x(x)=45 equation:

Simplifying
6 + 3x(x) = 45

Multiply x * x
6 + 3x2 = 45

Solving
6 + 3x2 = 45

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-6' to each side of the equation.
6 + -6 + 3x2 = 45 + -6

Combine like terms: 6 + -6 = 0
0 + 3x2 = 45 + -6
3x2 = 45 + -6

Combine like terms: 45 + -6 = 39
3x2 = 39

Divide each side by '3'.
x2 = 13

Simplifying
x2 = 13

Take the square root of each side:
x = {-3.605551275, 3.605551275}