8r^2-r-6=-10

Simple and best practice solution for 8r^2-r-6=-10 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 8r^2-r-6=-10 equation:


Simplifying
8r2 + -1r + -6 = -10

Reorder the terms:
-6 + -1r + 8r2 = -10

Solving
-6 + -1r + 8r2 = -10

Solving for variable 'r'.

Reorder the terms:
-6 + 10 + -1r + 8r2 = -10 + 10

Combine like terms: -6 + 10 = 4
4 + -1r + 8r2 = -10 + 10

Combine like terms: -10 + 10 = 0
4 + -1r + 8r2 = 0

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

Divide each side by '8'.
0.5 + -0.125r + r2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -0.125r + -0.5 + r2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -0.125r + r2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -0.125r + r2 = 0 + -0.5
-0.125r + r2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-0.125r + r2 = -0.5

The r term is -0.125r.  Take half its coefficient (-0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
-0.125r + 0.00390625 + r2 = -0.5 + 0.00390625

Reorder the terms:
0.00390625 + -0.125r + r2 = -0.5 + 0.00390625

Combine like terms: -0.5 + 0.00390625 = -0.49609375
0.00390625 + -0.125r + r2 = -0.49609375

Factor a perfect square on the left side:
(r + -0.0625)(r + -0.0625) = -0.49609375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

See similar equations:

| 5(1.072x+1)=12 | | 6(v-8)-8v=-34 | | 8*x/2=60 | | 4*(x-7)=1+3*(x-8) | | 6z=4+5z | | 121/6x=108 | | 3(x-3)-2(x+1)=-5 | | 3x+15x+18=0 | | 2x^2-4=21 | | x^2-200x+20000=0 | | 8x-2=190 | | 16x-4=16+7x | | 6(6k+7)= | | c=600x+30000 | | 5x+8(2.5)=40 | | -7y+3=2 | | 12*1/6x=108 | | -4w-4=-8 | | x+5+(2x+3)=14 | | 21-(x+8)=7x-3 | | Logx^8+logx^6=120 | | -x+11=-2.4+4 | | 2+2u=4 | | 33=42-x | | 4y-8=8y+16 | | Q=1/4aw | | -2+w=10 | | -4x-10=-2(3y+1) | | y+35=41 | | 2x+2-10=x+5 | | -4(x-2)+5x=10 | | 6u-65=4u-21 |

Equations solver categories