7x^2-4+x=15x

Simple and best practice solution for 7x^2-4+x=15x 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 7x^2-4+x=15x equation:


Simplifying
7x2 + -4 + x = 15x

Reorder the terms:
-4 + x + 7x2 = 15x

Solving
-4 + x + 7x2 = 15x

Solving for variable 'x'.

Reorder the terms:
-4 + x + -15x + 7x2 = 15x + -15x

Combine like terms: x + -15x = -14x
-4 + -14x + 7x2 = 15x + -15x

Combine like terms: 15x + -15x = 0
-4 + -14x + 7x2 = 0

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

Divide each side by '7'.
-0.5714285714 + -2x + x2 = 0

Move the constant term to the right:

Add '0.5714285714' to each side of the equation.
-0.5714285714 + -2x + 0.5714285714 + x2 = 0 + 0.5714285714

Reorder the terms:
-0.5714285714 + 0.5714285714 + -2x + x2 = 0 + 0.5714285714

Combine like terms: -0.5714285714 + 0.5714285714 = 0.0000000000
0.0000000000 + -2x + x2 = 0 + 0.5714285714
-2x + x2 = 0 + 0.5714285714

Combine like terms: 0 + 0.5714285714 = 0.5714285714
-2x + x2 = 0.5714285714

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 = 0.5714285714 + 1

Reorder the terms:
1 + -2x + x2 = 0.5714285714 + 1

Combine like terms: 0.5714285714 + 1 = 1.5714285714
1 + -2x + x2 = 1.5714285714

Factor a perfect square on the left side:
(x + -1)(x + -1) = 1.5714285714

Calculate the square root of the right side: 1.253566341

Break this problem into two subproblems by setting 
(x + -1) equal to 1.253566341 and -1.253566341.

Subproblem 1

x + -1 = 1.253566341 Simplifying x + -1 = 1.253566341 Reorder the terms: -1 + x = 1.253566341 Solving -1 + x = 1.253566341 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 = 1.253566341 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.253566341 + 1 x = 1.253566341 + 1 Combine like terms: 1.253566341 + 1 = 2.253566341 x = 2.253566341 Simplifying x = 2.253566341

Subproblem 2

x + -1 = -1.253566341 Simplifying x + -1 = -1.253566341 Reorder the terms: -1 + x = -1.253566341 Solving -1 + x = -1.253566341 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 = -1.253566341 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.253566341 + 1 x = -1.253566341 + 1 Combine like terms: -1.253566341 + 1 = -0.253566341 x = -0.253566341 Simplifying x = -0.253566341

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.253566341, -0.253566341}

See similar equations:

| 2=110*x | | y-5=y-9 | | 6x^2-4x+0=0 | | 53-x+8=4x-27+1 | | (2w+3)2+2x=42 | | 3(7-2k)=57 | | -8+4m^2-5m^2= | | 7x+3-2x+9=47 | | z-8.4=4 | | (x+(2+i))(x+(2-i))=0 | | -0.2(212-h)=8.6 | | 5x-10=39 | | 5.25b=22.75 | | -5x-2=-x-7 | | 3(x+1)+3(x+3)= | | 14x-(4x-5)=45 | | 7x-26=2x+54 | | -7(5k-5)=-210 | | 25-3u=24 | | 95=5X+2X+7 | | 2=10-1.6d | | 95=5X+2X+7 | | 95=5X+2X+6 | | 95=5X+2X+6 | | 5x-3(x-5)=-8+4x+17 | | 95=5X+2X+6 | | 6u-40=3(u+4)-4 | | 6u-40=3(u+4)-4 | | 8(10+3+5v)-2v= | | 5y-35x=-35 | | 2+4g=5+1g | | 5u+5=-26u |

Equations solver categories