(4x^2-3x-40)=0

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Solution for (4x^2-3x-40)=0 equation:


Simplifying
(4x2 + -3x + -40) = 0

Reorder the terms:
(-40 + -3x + 4x2) = 0

Remove parenthesis around (-40 + -3x + 4x2)
-40 + -3x + 4x2 = 0

Solving
-40 + -3x + 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'.
-10 + -0.75x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -0.75x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -0.75x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -0.75x + x2 = 0 + 10
-0.75x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-0.75x + x2 = 10

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 = 10 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 10 + 0.140625

Combine like terms: 10 + 0.140625 = 10.140625
0.140625 + -0.75x + x2 = 10.140625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 10.140625

Calculate the square root of the right side: 3.184434801

Break this problem into two subproblems by setting 
(x + -0.375) equal to 3.184434801 and -3.184434801.

Subproblem 1

x + -0.375 = 3.184434801 Simplifying x + -0.375 = 3.184434801 Reorder the terms: -0.375 + x = 3.184434801 Solving -0.375 + x = 3.184434801 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 = 3.184434801 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 3.184434801 + 0.375 x = 3.184434801 + 0.375 Combine like terms: 3.184434801 + 0.375 = 3.559434801 x = 3.559434801 Simplifying x = 3.559434801

Subproblem 2

x + -0.375 = -3.184434801 Simplifying x + -0.375 = -3.184434801 Reorder the terms: -0.375 + x = -3.184434801 Solving -0.375 + x = -3.184434801 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 = -3.184434801 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -3.184434801 + 0.375 x = -3.184434801 + 0.375 Combine like terms: -3.184434801 + 0.375 = -2.809434801 x = -2.809434801 Simplifying x = -2.809434801

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.559434801, -2.809434801}

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