2x^2-7=4x

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


Simplifying
2x2 + -7 = 4x

Reorder the terms:
-7 + 2x2 = 4x

Solving
-7 + 2x2 = 4x

Solving for variable 'x'.

Reorder the terms:
-7 + -4x + 2x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-7 + -4x + 2x2 = 0

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

Divide each side by '2'.
-3.5 + -2x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -2x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -2x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -2x + x2 = 0 + 3.5
-2x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-2x + x2 = 3.5

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 = 3.5 + 1

Reorder the terms:
1 + -2x + x2 = 3.5 + 1

Combine like terms: 3.5 + 1 = 4.5
1 + -2x + x2 = 4.5

Factor a perfect square on the left side:
(x + -1)(x + -1) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(x + -1) equal to 2.121320344 and -2.121320344.

Subproblem 1

x + -1 = 2.121320344 Simplifying x + -1 = 2.121320344 Reorder the terms: -1 + x = 2.121320344 Solving -1 + x = 2.121320344 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 = 2.121320344 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.121320344 + 1 x = 2.121320344 + 1 Combine like terms: 2.121320344 + 1 = 3.121320344 x = 3.121320344 Simplifying x = 3.121320344

Subproblem 2

x + -1 = -2.121320344 Simplifying x + -1 = -2.121320344 Reorder the terms: -1 + x = -2.121320344 Solving -1 + x = -2.121320344 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 = -2.121320344 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.121320344 + 1 x = -2.121320344 + 1 Combine like terms: -2.121320344 + 1 = -1.121320344 x = -1.121320344 Simplifying x = -1.121320344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.121320344, -1.121320344}

See similar equations:

| 10+6(a-7)=8(4a+9) | | -3=5+4x+36 | | -2.7x=31.59 | | .3=5+4x+36 | | -12v+6v=12 | | 0.05x+0.10(20-x)=1.20 | | -5(4x-2)+8x=5x-6 | | 2m-15p-3mp+10= | | 6x-12+15x+30= | | -6+2(x+5)=8(x-8)-10x | | 2(3x+5)=1x+8+5x | | 2(3x+5)=1x+8x+5x | | 7-1.2x=3 | | X*x*x-4x*4x=0 | | 4-(n-4)=3(3+2) | | 64x^3-125y^3= | | -5(k-3)+5=6k-5(k+2) | | 2n-3-7=n-2-5 | | 2.3m=1.2 | | 32x-16y=96 | | t^2-5t=24 | | 2x-5=x-1-3 | | -5v+-8v=13 | | 2(8-3y)=4y-9 | | 5(-6x-1)=5(3-7x) | | 18n^2-8= | | 3-5=x+2-6 | | 60=k-3 | | 128x^3-250y^3= | | x+2-5=7-5 | | -37-8n=6n+7(1+6n) | | -5(a-3)-3=-6a+7(a+1) |

Equations solver categories