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Simplifying
3x(7x) = 0.9 + 6
Remove parenthesis around (7x)
3x * 7x = 0.9 + 6
Reorder the terms for easier multiplication:
3 * 7x * x = 0.9 + 6
Multiply 3 * 7
21x * x = 0.9 + 6
Multiply x * x
21x2 = 0.9 + 6
Combine like terms: 0.9 + 6 = 6.9
21x2 = 6.9
Solving
21x2 = 6.9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '21'.
x2 = 0.3285714286
Simplifying
x2 = 0.3285714286
Take the square root of each side:
x = {-0.573211504, 0.573211504}
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