75=-1.8(x*x)+21X+15

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Solution for 75=-1.8(x*x)+21X+15 equation: 


Simplifying
75 = -1.8(x * x) + 21X + 15

Multiply x * x
75 = -1.8(x2) + 21X + 15

Reorder the terms:
75 = 15 + 21X + -1.8x2

Solving
75 = 15 + 21X + -1.8x2

Solving for variable 'X'.

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

Add '-21X' to each side of the equation.
75 + -21X = 15 + 21X + -21X + -1.8x2

Combine like terms: 21X + -21X = 0
75 + -21X = 15 + 0 + -1.8x2
75 + -21X = 15 + -1.8x2

Add '-75' to each side of the equation.
75 + -75 + -21X = 15 + -75 + -1.8x2

Combine like terms: 75 + -75 = 0
0 + -21X = 15 + -75 + -1.8x2
-21X = 15 + -75 + -1.8x2

Combine like terms: 15 + -75 = -60
-21X = -60 + -1.8x2

Divide each side by '-21'.
X = 2.857142857 + 0.08571428571x2

Simplifying
X = 2.857142857 + 0.08571428571x2

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