x^2+2x=75

Simple and best practice solution for x^2+2x=75 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for x^2+2x=75 equation:


Simplifying
x2 + 2x = 75

Reorder the terms:
2x + x2 = 75

Solving
2x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
-75 + 2x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-75 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + 2x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + 2x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 2x + x2 = 0 + 75
2x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
2x + x2 = 75

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 75 + 1

Reorder the terms:
1 + 2x + x2 = 75 + 1

Combine like terms: 75 + 1 = 76
1 + 2x + x2 = 76

Factor a perfect square on the left side:
(x + 1)(x + 1) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(x + 1) equal to 8.717797887 and -8.717797887.

Subproblem 1

x + 1 = 8.717797887 Simplifying x + 1 = 8.717797887 Reorder the terms: 1 + x = 8.717797887 Solving 1 + x = 8.717797887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 8.717797887 + -1 Combine like terms: 1 + -1 = 0 0 + x = 8.717797887 + -1 x = 8.717797887 + -1 Combine like terms: 8.717797887 + -1 = 7.717797887 x = 7.717797887 Simplifying x = 7.717797887

Subproblem 2

x + 1 = -8.717797887 Simplifying x + 1 = -8.717797887 Reorder the terms: 1 + x = -8.717797887 Solving 1 + x = -8.717797887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -8.717797887 + -1 Combine like terms: 1 + -1 = 0 0 + x = -8.717797887 + -1 x = -8.717797887 + -1 Combine like terms: -8.717797887 + -1 = -9.717797887 x = -9.717797887 Simplifying x = -9.717797887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.717797887, -9.717797887}

See similar equations:

| 4ab=0 | | 8m+11=43 | | X(x+7)=14 | | 2y-6=-4 | | -3,5-2,-1= | | 3-2(x-1)=2+4x | | 5z-9=36 | | 3x-5x=4x-2(4-x) | | 15+2y=1 | | 7n-35=7(6n+5) | | -5+2y=8 | | 4n+7=11 | | .25x-7=0.333x+8 | | 6-7y=8 | | (x^2)(y)=1000 | | -22+2x=8(4-2x) | | (x^3y-3X^2Y^2+7XY^3)= | | 6-4(n+2)=3n+5(n-8) | | 16x-2y=48 | | x-5=-5-7x | | 0+3y+1=2 | | 3a^3+18a^2+24a= | | 8x+9=4(2x-7) | | 8(-4)-3(-8)= | | 2(x-0.5)=4(x+.25) | | -8+6y=16 | | 3y+3=-3 | | 4+5=3-2y | | x=y^2-17 | | 6+3y=12 | | X-4y=20 | | b=5a-4 |

Equations solver categories