4x^2-x=7

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


Simplifying
4x2 + -1x = 7

Reorder the terms:
-1x + 4x2 = 7

Solving
-1x + 4x2 = 7

Solving for variable 'x'.

Reorder the terms:
-7 + -1x + 4x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + -1x + 4x2 = 0

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

Divide each side by '4'.
-1.75 + -0.25x + x2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -0.25x + 1.75 + x2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -0.25x + x2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -0.25x + x2 = 0 + 1.75
-0.25x + x2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-0.25x + x2 = 1.75

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 1.75 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 1.75 + 0.015625

Combine like terms: 1.75 + 0.015625 = 1.765625
0.015625 + -0.25x + x2 = 1.765625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 1.765625

Calculate the square root of the right side: 1.328768227

Break this problem into two subproblems by setting 
(x + -0.125) equal to 1.328768227 and -1.328768227.

Subproblem 1

x + -0.125 = 1.328768227 Simplifying x + -0.125 = 1.328768227 Reorder the terms: -0.125 + x = 1.328768227 Solving -0.125 + x = 1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 1.328768227 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 1.328768227 + 0.125 x = 1.328768227 + 0.125 Combine like terms: 1.328768227 + 0.125 = 1.453768227 x = 1.453768227 Simplifying x = 1.453768227

Subproblem 2

x + -0.125 = -1.328768227 Simplifying x + -0.125 = -1.328768227 Reorder the terms: -0.125 + x = -1.328768227 Solving -0.125 + x = -1.328768227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -1.328768227 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -1.328768227 + 0.125 x = -1.328768227 + 0.125 Combine like terms: -1.328768227 + 0.125 = -1.203768227 x = -1.203768227 Simplifying x = -1.203768227

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.453768227, -1.203768227}

See similar equations:

| 5w-5=6w | | 10-3a=25 | | 7h+8=-4+9h | | x+(x+5)+2(x+5)=431 | | (3x^2)-6x=3 | | -3b=-4b+5 | | 4f=10-f | | 6k=-8+5k | | -10(x-1)=10-20x | | 3p+21q+15r= | | 3x+22=5x+39 | | 7+4(5-1)=y+32(2-(-1)) | | 45=-72+-9e | | 5(2p+3)= | | 5d=70answer | | 5(x+3)+x=4(2x-1)-1 | | 6w+9=-15 | | 2(y+2)-6y=8 | | -23-23= | | 3(x+2)-2= | | 9x-8=4X+42 | | 4ax+3x=2c | | 26+7x=4x+47 | | c/25-565=-591 | | (4x-1)(5x-2)-16x^2+1=0 | | c/25+565=-591 | | (8)+(1.15a)-(0.4a)=(-7) | | 8+1.15a-0.4a=-7 | | 7h-25=31 | | u/3-1.8=1.73 | | 5b^5+b^2-b^3-3b^5-5b^2= | | (X)(x+7)=0 |

Equations solver categories