x^2-8x=-3

Simple and best practice solution for x^2-8x=-3 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^2-8x=-3 equation:


Simplifying
x2 + -8x = -3

Reorder the terms:
-8x + x2 = -3

Solving
-8x + x2 = -3

Solving for variable 'x'.

Reorder the terms:
3 + -8x + x2 = -3 + 3

Combine like terms: -3 + 3 = 0
3 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -8x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + -8x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -8x + x2 = 0 + -3
-8x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
-8x + x2 = -3

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -3 + 16

Reorder the terms:
16 + -8x + x2 = -3 + 16

Combine like terms: -3 + 16 = 13
16 + -8x + x2 = 13

Factor a perfect square on the left side:
(x + -4)(x + -4) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(x + -4) equal to 3.605551275 and -3.605551275.

Subproblem 1

x + -4 = 3.605551275 Simplifying x + -4 = 3.605551275 Reorder the terms: -4 + x = 3.605551275 Solving -4 + x = 3.605551275 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3.605551275 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.605551275 + 4 x = 3.605551275 + 4 Combine like terms: 3.605551275 + 4 = 7.605551275 x = 7.605551275 Simplifying x = 7.605551275

Subproblem 2

x + -4 = -3.605551275 Simplifying x + -4 = -3.605551275 Reorder the terms: -4 + x = -3.605551275 Solving -4 + x = -3.605551275 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3.605551275 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.605551275 + 4 x = -3.605551275 + 4 Combine like terms: -3.605551275 + 4 = 0.394448725 x = 0.394448725 Simplifying x = 0.394448725

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.605551275, 0.394448725}

See similar equations:

| 7x-26+5x-10=180 | | 2x-(2-2x)-1=3x+8 | | 28+2y=-5y | | 5(5x+10)=6(6x+2)-8 | | 3x-13=x | | 4(k-4)-6(2k+7)= | | 4X^2+14x+12=6-12x-8x^2 | | x(x+4)=192 | | 4X^2+14x-18=6-12x-8x^2 | | (n-2)*180/n=171 | | 3x^4+2x^2=0 | | 2s+6=4 | | 3x+156+6x+114=180 | | -2x^2+2x-2=0 | | 6=3(w+45)-78 | | 19=q+7 | | 4-(2x-6)=8x-12+6 | | 4/3×15×3.14 | | 6(b-84)-33=39 | | -36=9(g+31)+-18 | | ln(x-2)-ln(x+5)=ln(x-1)-ln(x+8) | | 5x=12+2 | | 10=2(g-15)+2 | | 12/f=4 | | 7-d=13 | | Y=11X^2-176 | | 16t^2=1056 | | a-(4a+4)=11 | | v=7i+8-4i | | 4X^2+14x+18=6-12x-8x^2 | | 0=-2x^2+30x+87.5 | | (15-13)+2= |

Equations solver categories