4x^2-25x-36=0

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Solution for 4x^2-25x-36=0 equation:


Simplifying
4x2 + -25x + -36 = 0

Reorder the terms:
-36 + -25x + 4x2 = 0

Solving
-36 + -25x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-9 + -6.25x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6.25x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -6.25x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6.25x + x2 = 0 + 9
-6.25x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-6.25x + x2 = 9

The x term is -6.25x.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25x + 9.765625 + x2 = 9 + 9.765625

Reorder the terms:
9.765625 + -6.25x + x2 = 9 + 9.765625

Combine like terms: 9 + 9.765625 = 18.765625
9.765625 + -6.25x + x2 = 18.765625

Factor a perfect square on the left side:
(x + -3.125)(x + -3.125) = 18.765625

Calculate the square root of the right side: 4.331930863

Break this problem into two subproblems by setting 
(x + -3.125) equal to 4.331930863 and -4.331930863.

Subproblem 1

x + -3.125 = 4.331930863 Simplifying x + -3.125 = 4.331930863 Reorder the terms: -3.125 + x = 4.331930863 Solving -3.125 + x = 4.331930863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = 4.331930863 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = 4.331930863 + 3.125 x = 4.331930863 + 3.125 Combine like terms: 4.331930863 + 3.125 = 7.456930863 x = 7.456930863 Simplifying x = 7.456930863

Subproblem 2

x + -3.125 = -4.331930863 Simplifying x + -3.125 = -4.331930863 Reorder the terms: -3.125 + x = -4.331930863 Solving -3.125 + x = -4.331930863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + x = -4.331930863 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + x = -4.331930863 + 3.125 x = -4.331930863 + 3.125 Combine like terms: -4.331930863 + 3.125 = -1.206930863 x = -1.206930863 Simplifying x = -1.206930863

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.456930863, -1.206930863}

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