x(x-15)+3(u-3)=0

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Solution for x(x-15)+3(u-3)=0 equation: 


Simplifying
x(x + -15) + 3(u + -3) = 0

Reorder the terms:
x(-15 + x) + 3(u + -3) = 0
(-15 * x + x * x) + 3(u + -3) = 0
(-15x + x2) + 3(u + -3) = 0

Reorder the terms:
-15x + x2 + 3(-3 + u) = 0
-15x + x2 + (-3 * 3 + u * 3) = 0
-15x + x2 + (-9 + 3u) = 0

Reorder the terms:
-9 + 3u + -15x + x2 = 0

Solving
-9 + 3u + -15x + x2 = 0

Solving for variable 'u'.

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

Add '9' to each side of the equation.
-9 + 3u + -15x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 3u + -15x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 3u + -15x + x2 = 0 + 9
3u + -15x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
3u + -15x + x2 = 9

Add '15x' to each side of the equation.
3u + -15x + 15x + x2 = 9 + 15x

Combine like terms: -15x + 15x = 0
3u + 0 + x2 = 9 + 15x
3u + x2 = 9 + 15x

Add '-1x2' to each side of the equation.
3u + x2 + -1x2 = 9 + 15x + -1x2

Combine like terms: x2 + -1x2 = 0
3u + 0 = 9 + 15x + -1x2
3u = 9 + 15x + -1x2

Divide each side by '3'.
u = 3 + 5x + -0.3333333333x2

Simplifying
u = 3 + 5x + -0.3333333333x2

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