15-3x*5x=21

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Solution for 15-3x*5x=21 equation:


Simplifying
15 + -3x * 5x = 21

Reorder the terms for easier multiplication:
15 + -3 * 5x * x = 21

Multiply -3 * 5
15 + -15x * x = 21

Multiply x * x
15 + -15x2 = 21

Solving
15 + -15x2 = 21

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -15x2 = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -15x2 = 21 + -15
-15x2 = 21 + -15

Combine like terms: 21 + -15 = 6
-15x2 = 6

Divide each side by '-15'.
x2 = -0.4

Simplifying
x2 = -0.4

Reorder the terms:
0.4 + x2 = -0.4 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.4 + x2 = 0.0

The solution to this equation could not be determined.

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