4x^2-35x+28=0

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Solution for 4x^2-35x+28=0 equation:


Simplifying
4x2 + -35x + 28 = 0

Reorder the terms:
28 + -35x + 4x2 = 0

Solving
28 + -35x + 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'.
7 + -8.75x + x2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -8.75x + -7 + x2 = 0 + -7

Reorder the terms:
7 + -7 + -8.75x + x2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -8.75x + x2 = 0 + -7
-8.75x + x2 = 0 + -7

Combine like terms: 0 + -7 = -7
-8.75x + x2 = -7

The x term is -8.75x.  Take half its coefficient (-4.375).
Square it (19.140625) and add it to both sides.

Add '19.140625' to each side of the equation.
-8.75x + 19.140625 + x2 = -7 + 19.140625

Reorder the terms:
19.140625 + -8.75x + x2 = -7 + 19.140625

Combine like terms: -7 + 19.140625 = 12.140625
19.140625 + -8.75x + x2 = 12.140625

Factor a perfect square on the left side:
(x + -4.375)(x + -4.375) = 12.140625

Calculate the square root of the right side: 3.484339966

Break this problem into two subproblems by setting 
(x + -4.375) equal to 3.484339966 and -3.484339966.

Subproblem 1

x + -4.375 = 3.484339966 Simplifying x + -4.375 = 3.484339966 Reorder the terms: -4.375 + x = 3.484339966 Solving -4.375 + x = 3.484339966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.375' to each side of the equation. -4.375 + 4.375 + x = 3.484339966 + 4.375 Combine like terms: -4.375 + 4.375 = 0.000 0.000 + x = 3.484339966 + 4.375 x = 3.484339966 + 4.375 Combine like terms: 3.484339966 + 4.375 = 7.859339966 x = 7.859339966 Simplifying x = 7.859339966

Subproblem 2

x + -4.375 = -3.484339966 Simplifying x + -4.375 = -3.484339966 Reorder the terms: -4.375 + x = -3.484339966 Solving -4.375 + x = -3.484339966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.375' to each side of the equation. -4.375 + 4.375 + x = -3.484339966 + 4.375 Combine like terms: -4.375 + 4.375 = 0.000 0.000 + x = -3.484339966 + 4.375 x = -3.484339966 + 4.375 Combine like terms: -3.484339966 + 4.375 = 0.890660034 x = 0.890660034 Simplifying x = 0.890660034

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.859339966, 0.890660034}

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