0=-16(X^2)+(120X)+25

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Solution for 0=-16(X^2)+(120X)+25 equation:


Simplifying
0 = -16(X2) + (120X) + 25

Reorder the terms:
0 = 25 + (120X) + -16X2

Solving
0 = 25 + (120X) + -16X2

Solving for variable 'X'.

Combine like terms: 0 + -25 = -25
-25 + (-120X) + 16X2 = 25 + (120X) + -16X2 + -25 + (-120X) + 16X2

Reorder the terms:
-25 + (-120X) + 16X2 = 25 + -25 + (120X) + (-120X) + -16X2 + 16X2

Combine like terms: 25 + -25 = 0
-25 + (-120X) + 16X2 = 0 + (120X) + (-120X) + -16X2 + 16X2
-25 + (-120X) + 16X2 = (120X) + (-120X) + -16X2 + 16X2

Combine like terms: (120X) + (-120X) = 0
-25 + (-120X) + 16X2 = 0 + -16X2 + 16X2
-25 + (-120X) + 16X2 = -16X2 + 16X2

Combine like terms: -16X2 + 16X2 = 0
-25 + (-120X) + 16X2 = 0

Begin completing the square.  Divide all terms by
16 the coefficient of the squared term: 

Divide each side by '16'.
-1.5625 + (-7.5X) + X2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + (-7.5X) + 1.5625 + X2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + (-7.5X) + X2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + (-7.5X) + X2 = 0 + 1.5625
(-7.5X) + X2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
(-7.5X) + X2 = 1.5625

The X term is (-7.5X).  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
(-7.5X) + 14.0625 + X2 = 1.5625 + 14.0625

Reorder the terms:
14.0625 + (-7.5X) + X2 = 1.5625 + 14.0625

Combine like terms: 1.5625 + 14.0625 = 15.625
14.0625 + (-7.5X) + X2 = 15.625

Factor a perfect square on the left side:
(X + -3.75)(X + -3.75) = 15.625

Calculate the square root of the right side: 3.952847075

Break this problem into two subproblems by setting 
(X + -3.75) equal to 3.952847075 and -3.952847075.

Subproblem 1

X + -3.75 = 3.952847075 Simplifying X + -3.75 = 3.952847075 Reorder the terms: -3.75 + X = 3.952847075 Solving -3.75 + X = 3.952847075 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + X = 3.952847075 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + X = 3.952847075 + 3.75 X = 3.952847075 + 3.75 Combine like terms: 3.952847075 + 3.75 = 7.702847075 X = 7.702847075 Simplifying X = 7.702847075

Subproblem 2

X + -3.75 = -3.952847075 Simplifying X + -3.75 = -3.952847075 Reorder the terms: -3.75 + X = -3.952847075 Solving -3.75 + X = -3.952847075 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + X = -3.952847075 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + X = -3.952847075 + 3.75 X = -3.952847075 + 3.75 Combine like terms: -3.952847075 + 3.75 = -0.202847075 X = -0.202847075 Simplifying X = -0.202847075

Solution

The solution to the problem is based on the solutions from the subproblems. X = {7.702847075, -0.202847075}

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