5x^2-7x-2=8

Simple and best practice solution for 5x^2-7x-2=8 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 5x^2-7x-2=8 equation:


Simplifying
5x2 + -7x + -2 = 8

Reorder the terms:
-2 + -7x + 5x2 = 8

Solving
-2 + -7x + 5x2 = 8

Solving for variable 'x'.

Reorder the terms:
-2 + -8 + -7x + 5x2 = 8 + -8

Combine like terms: -2 + -8 = -10
-10 + -7x + 5x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-10 + -7x + 5x2 = 0

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

Divide each side by '5'.
-2 + -1.4x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -1.4x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -1.4x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1.4x + x2 = 0 + 2
-1.4x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-1.4x + x2 = 2

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 2 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 2 + 0.49

Combine like terms: 2 + 0.49 = 2.49
0.49 + -1.4x + x2 = 2.49

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 2.49

Calculate the square root of the right side: 1.577973384

Break this problem into two subproblems by setting 
(x + -0.7) equal to 1.577973384 and -1.577973384.

Subproblem 1

x + -0.7 = 1.577973384 Simplifying x + -0.7 = 1.577973384 Reorder the terms: -0.7 + x = 1.577973384 Solving -0.7 + x = 1.577973384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 1.577973384 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 1.577973384 + 0.7 x = 1.577973384 + 0.7 Combine like terms: 1.577973384 + 0.7 = 2.277973384 x = 2.277973384 Simplifying x = 2.277973384

Subproblem 2

x + -0.7 = -1.577973384 Simplifying x + -0.7 = -1.577973384 Reorder the terms: -0.7 + x = -1.577973384 Solving -0.7 + x = -1.577973384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -1.577973384 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -1.577973384 + 0.7 x = -1.577973384 + 0.7 Combine like terms: -1.577973384 + 0.7 = -0.877973384 x = -0.877973384 Simplifying x = -0.877973384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.277973384, -0.877973384}

See similar equations:

| 9s^2-16=0 | | .5a-6.2+2.8=.1 | | 4x^2-25x+11=-4x+6 | | 28=a+24 | | 58-3x=13-18x | | 3x+2y=57 | | 6(3x+2)=7 | | 4x-9+3x=6+5x-11 | | h+15=16h | | 4x+7=-49-4x | | 5x-14=x+30 | | 2x-5=0.1x+2 | | X+6=15x^2 | | x+29=4x+38 | | 5x=-3.3 | | Y-6=2(X-10) | | 4y+(2y-4)=y | | (7x+4)(3x-5)= | | 2x+4+2x=-16 | | log(9)(x+2)-log(3)(x)=0 | | 4+10x=4+x | | 2y^2=64 | | 5x=-3.33333333333333 | | x^2-5-15=-2x-5 | | 8y=6x-2 | | 5x-14=x+10 | | 10x-4=x-13 | | y=-x^2-2x+1 | | 2m-4m+5=11 | | z=3-i | | 8+7x+4x=52 | | 0=x^3-4x-20 |

Equations solver categories