4x^2+7x=10

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Solution for 4x^2+7x=10 equation:


Simplifying
4x2 + 7x = 10

Reorder the terms:
7x + 4x2 = 10

Solving
7x + 4x2 = 10

Solving for variable 'x'.

Reorder the terms:
-10 + 7x + 4x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 7x + 4x2 = 0

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

Divide each side by '4'.
-2.5 + 1.75x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 1.75x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 1.75x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 1.75x + x2 = 0 + 2.5
1.75x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
1.75x + x2 = 2.5

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = 2.5 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = 2.5 + 0.765625

Combine like terms: 2.5 + 0.765625 = 3.265625
0.765625 + 1.75x + x2 = 3.265625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 3.265625

Calculate the square root of the right side: 1.807104037

Break this problem into two subproblems by setting 
(x + 0.875) equal to 1.807104037 and -1.807104037.

Subproblem 1

x + 0.875 = 1.807104037 Simplifying x + 0.875 = 1.807104037 Reorder the terms: 0.875 + x = 1.807104037 Solving 0.875 + x = 1.807104037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 1.807104037 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 1.807104037 + -0.875 x = 1.807104037 + -0.875 Combine like terms: 1.807104037 + -0.875 = 0.932104037 x = 0.932104037 Simplifying x = 0.932104037

Subproblem 2

x + 0.875 = -1.807104037 Simplifying x + 0.875 = -1.807104037 Reorder the terms: 0.875 + x = -1.807104037 Solving 0.875 + x = -1.807104037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -1.807104037 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -1.807104037 + -0.875 x = -1.807104037 + -0.875 Combine like terms: -1.807104037 + -0.875 = -2.682104037 x = -2.682104037 Simplifying x = -2.682104037

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.932104037, -2.682104037}

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