3x(7x)=84

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Solution for 3x(7x)=84 equation: 


Simplifying
3x(7x) = 84

Remove parenthesis around (7x)
3x * 7x = 84

Reorder the terms for easier multiplication:
3 * 7x * x = 84

Multiply 3 * 7
21x * x = 84

Multiply x * x
21x2 = 84

Solving
21x2 = 84

Solving for variable 'x'.

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

Divide each side by '21'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}

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