4x^2-7x+3=8x+4

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Solution for 4x^2-7x+3=8x+4 equation:


Simplifying
4x2 + -7x + 3 = 8x + 4

Reorder the terms:
3 + -7x + 4x2 = 8x + 4

Reorder the terms:
3 + -7x + 4x2 = 4 + 8x

Solving
3 + -7x + 4x2 = 4 + 8x

Solving for variable 'x'.

Reorder the terms:
3 + -4 + -7x + -8x + 4x2 = 4 + 8x + -4 + -8x

Combine like terms: 3 + -4 = -1
-1 + -7x + -8x + 4x2 = 4 + 8x + -4 + -8x

Combine like terms: -7x + -8x = -15x
-1 + -15x + 4x2 = 4 + 8x + -4 + -8x

Reorder the terms:
-1 + -15x + 4x2 = 4 + -4 + 8x + -8x

Combine like terms: 4 + -4 = 0
-1 + -15x + 4x2 = 0 + 8x + -8x
-1 + -15x + 4x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
-1 + -15x + 4x2 = 0

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

Divide each side by '4'.
-0.25 + -3.75x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -3.75x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -3.75x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -3.75x + x2 = 0 + 0.25
-3.75x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-3.75x + x2 = 0.25

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 = 0.25 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 0.25 + 3.515625

Combine like terms: 0.25 + 3.515625 = 3.765625
3.515625 + -3.75x + x2 = 3.765625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 3.765625

Calculate the square root of the right side: 1.940521837

Break this problem into two subproblems by setting 
(x + -1.875) equal to 1.940521837 and -1.940521837.

Subproblem 1

x + -1.875 = 1.940521837 Simplifying x + -1.875 = 1.940521837 Reorder the terms: -1.875 + x = 1.940521837 Solving -1.875 + x = 1.940521837 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 = 1.940521837 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 1.940521837 + 1.875 x = 1.940521837 + 1.875 Combine like terms: 1.940521837 + 1.875 = 3.815521837 x = 3.815521837 Simplifying x = 3.815521837

Subproblem 2

x + -1.875 = -1.940521837 Simplifying x + -1.875 = -1.940521837 Reorder the terms: -1.875 + x = -1.940521837 Solving -1.875 + x = -1.940521837 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 = -1.940521837 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -1.940521837 + 1.875 x = -1.940521837 + 1.875 Combine like terms: -1.940521837 + 1.875 = -0.065521837 x = -0.065521837 Simplifying x = -0.065521837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.815521837, -0.065521837}

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