2x^2+10x=15

Simple and best practice solution for 2x^2+10x=15 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 2x^2+10x=15 equation:


Simplifying
2x2 + 10x = 15

Reorder the terms:
10x + 2x2 = 15

Solving
10x + 2x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 10x + 2x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 10x + 2x2 = 0

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

Divide each side by '2'.
-7.5 + 5x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 5x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 5x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 5x + x2 = 0 + 7.5
5x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
5x + x2 = 7.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 7.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 7.5 + 6.25

Combine like terms: 7.5 + 6.25 = 13.75
6.25 + 5x + x2 = 13.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 13.75

Calculate the square root of the right side: 3.708099244

Break this problem into two subproblems by setting 
(x + 2.5) equal to 3.708099244 and -3.708099244.

Subproblem 1

x + 2.5 = 3.708099244 Simplifying x + 2.5 = 3.708099244 Reorder the terms: 2.5 + x = 3.708099244 Solving 2.5 + x = 3.708099244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 3.708099244 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 3.708099244 + -2.5 x = 3.708099244 + -2.5 Combine like terms: 3.708099244 + -2.5 = 1.208099244 x = 1.208099244 Simplifying x = 1.208099244

Subproblem 2

x + 2.5 = -3.708099244 Simplifying x + 2.5 = -3.708099244 Reorder the terms: 2.5 + x = -3.708099244 Solving 2.5 + x = -3.708099244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -3.708099244 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -3.708099244 + -2.5 x = -3.708099244 + -2.5 Combine like terms: -3.708099244 + -2.5 = -6.208099244 x = -6.208099244 Simplifying x = -6.208099244

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.208099244, -6.208099244}

See similar equations:

| 70=6x+5x-7 | | 4(-5-5x)=-200 | | 40+273= | | (2y+5)(3y+7)= | | 2(-5+x)=14 | | -8(x+1)+5(3x-4)=6(x-6)+14 | | 10ac*6ab*(-2bc)= | | 6(8+x)=6 | | 2x^2+3x=4 | | 14x+32=70 | | 6x-6-3x=-18 | | 6(-11+2n)-2n=-7(-n+3) | | 2(6+7x)=68 | | 0.75a+14=8 | | 5t-4=4+t | | 5(6x-10)=-20 | | (8a^2-6a-8)-(-6a^2+7a+5)= | | 4(n-6)-(2-3n)=6n | | 4x+1=34+7x | | (x-2)(x+6)=3x | | 3x+30=81 | | x^2+24x-112=0 | | -y=-x-4 | | b^2=2b | | t(t-7)=18 | | x^2-x+649=0 | | -2(x+5)+4x= | | -10-2x=x+5 | | y=x^2+3x-5 | | 10x-3x-9+3-x=18 | | 17x-8=12x+33 | | 4x-1=3x+4 |

Equations solver categories