x^2-3.75x=1

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Solution for x^2-3.75x=1 equation:


Simplifying
x2 + -3.75x = 1

Reorder the terms:
-3.75x + x2 = 1

Solving
-3.75x + x2 = 1

Solving for variable 'x'.

Reorder the terms:
-1 + -3.75x + x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + -3.75x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -3.75x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -3.75x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -3.75x + x2 = 0 + 1
-3.75x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-3.75x + x2 = 1

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = 1 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 1 + 3.515625

Combine like terms: 1 + 3.515625 = 4.515625
3.515625 + -3.75x + x2 = 4.515625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 4.515625

Calculate the square root of the right side: 2.125

Break this problem into two subproblems by setting 
(x + -1.875) equal to 2.125 and -2.125.

Subproblem 1

x + -1.875 = 2.125 Simplifying x + -1.875 = 2.125 Reorder the terms: -1.875 + x = 2.125 Solving -1.875 + x = 2.125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 2.125 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.125 + 1.875 x = 2.125 + 1.875 Combine like terms: 2.125 + 1.875 = 4 x = 4 Simplifying x = 4

Subproblem 2

x + -1.875 = -2.125 Simplifying x + -1.875 = -2.125 Reorder the terms: -1.875 + x = -2.125 Solving -1.875 + x = -2.125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -2.125 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.125 + 1.875 x = -2.125 + 1.875 Combine like terms: -2.125 + 1.875 = -0.25 x = -0.25 Simplifying x = -0.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -0.25}

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