2x*x+3x*2x=72

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Solution for 2x*x+3x*2x=72 equation: 


Simplifying
2x * x + 3x * 2x = 72

Multiply x * x
2x2 + 3x * 2x = 72

Reorder the terms for easier multiplication:
2x2 + 3 * 2x * x = 72

Multiply 3 * 2
2x2 + 6x * x = 72

Multiply x * x
2x2 + 6x2 = 72

Combine like terms: 2x2 + 6x2 = 8x2
8x2 = 72

Solving
8x2 = 72

Solving for variable 'x'.

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

Divide each side by '8'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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