x^2-0.75x=19

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Solution for x^2-0.75x=19 equation:


Simplifying
x2 + -0.75x = 19

Reorder the terms:
-0.75x + x2 = 19

Solving
-0.75x + x2 = 19

Solving for variable 'x'.

Reorder the terms:
-19 + -0.75x + x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + -0.75x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -0.75x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -0.75x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -0.75x + x2 = 0 + 19
-0.75x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-0.75x + x2 = 19

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 19 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 19 + 0.140625

Combine like terms: 19 + 0.140625 = 19.140625
0.140625 + -0.75x + x2 = 19.140625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 19.140625

Calculate the square root of the right side: 4.375

Break this problem into two subproblems by setting 
(x + -0.375) equal to 4.375 and -4.375.

Subproblem 1

x + -0.375 = 4.375 Simplifying x + -0.375 = 4.375 Reorder the terms: -0.375 + x = 4.375 Solving -0.375 + x = 4.375 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 4.375 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 4.375 + 0.375 x = 4.375 + 0.375 Combine like terms: 4.375 + 0.375 = 4.75 x = 4.75 Simplifying x = 4.75

Subproblem 2

x + -0.375 = -4.375 Simplifying x + -0.375 = -4.375 Reorder the terms: -0.375 + x = -4.375 Solving -0.375 + x = -4.375 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -4.375 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -4.375 + 0.375 x = -4.375 + 0.375 Combine like terms: -4.375 + 0.375 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.75, -4}

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