[(2)(x)(x)]+8x-7=0

Simple and best practice solution for [(2)(x)(x)]+8x-7=0 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 [(2)(x)(x)]+8x-7=0 equation:


Simplifying
[(2)(x)(x)] + 8x + -7 = 0

Multiply x * x
[2x2] + 8x + -7 = 0

Reorder the terms:
-7 + 8x + [2x2] = 0

Solving
-7 + 8x + [2x2] = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-3.5 + 4x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 4x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 4x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 4x + x2 = 0 + 3.5
4x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
4x + x2 = 3.5

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 3.5 + 4

Reorder the terms:
4 + 4x + x2 = 3.5 + 4

Combine like terms: 3.5 + 4 = 7.5
4 + 4x + x2 = 7.5

Factor a perfect square on the left side:
([x] + 2)([x] + 2) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
([x] + 2) equal to 2.738612788 and -2.738612788.

Subproblem 1

[x] + 2 = 2.738612788 Simplifying [x] + 2 = 2.738612788 x + 2 = 2.738612788 Reorder the terms: 2 + x = 2.738612788 Solving 2 + x = 2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.738612788 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.738612788 + -2 x = 2.738612788 + -2 Combine like terms: 2.738612788 + -2 = 0.738612788 x = 0.738612788 Simplifying x = 0.738612788

Subproblem 2

[x] + 2 = -2.738612788 Simplifying [x] + 2 = -2.738612788 x + 2 = -2.738612788 Reorder the terms: 2 + x = -2.738612788 Solving 2 + x = -2.738612788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.738612788 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.738612788 + -2 x = -2.738612788 + -2 Combine like terms: -2.738612788 + -2 = -4.738612788 x = -4.738612788 Simplifying x = -4.738612788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.738612788, -4.738612788}

See similar equations:

| 21.21+p=-10.16 | | 36=I^2 | | 6-17z=13z+18 | | [(x)(x)]+6x=1 | | 49=i^2 | | (3y-7)6+8y= | | 8d-12=d+2 | | -4(2-3x)=6x-2(3x-4) | | 3(9x+4)= | | F(x)=c^2+8x | | 2-(x-3)=3x+3(x+4) | | 8.2=5.8 | | [(x)(x)]+6x= | | v^2=46 | | [(x)(x)]-14x=-48 | | 3ln(2x)=3+ln(27) | | 2x+3y+16=5y+4xfory | | 11y-11=18 | | 5(3x+4)=60 | | 5-(2-4x)=6x+10 | | 7a=5a+10 | | k^2=67 | | 5x+9x-2=11+7.6 | | 13x+11y=175 | | 2x-15-X=22+x | | (7y-3)6+8y= | | 283.89-133.71= | | 3x-5(x-3)=4+5x-9 | | Y=ax+5 | | 5x=18-8 | | x-7=11-5x | | 8+.25x=0.31(20+x) |

Equations solver categories