-w^2+8w+72=0

Simple and best practice solution for -w^2+8w+72=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 -w^2+8w+72=0 equation:


Simplifying
-1w2 + 8w + 72 = 0

Reorder the terms:
72 + 8w + -1w2 = 0

Solving
72 + 8w + -1w2 = 0

Solving for variable 'w'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-72 + -8w + w2 = 0

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -8w + 72 + w2 = 0 + 72

Reorder the terms:
-72 + 72 + -8w + w2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -8w + w2 = 0 + 72
-8w + w2 = 0 + 72

Combine like terms: 0 + 72 = 72
-8w + w2 = 72

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

Add '16' to each side of the equation.
-8w + 16 + w2 = 72 + 16

Reorder the terms:
16 + -8w + w2 = 72 + 16

Combine like terms: 72 + 16 = 88
16 + -8w + w2 = 88

Factor a perfect square on the left side:
(w + -4)(w + -4) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(w + -4) equal to 9.38083152 and -9.38083152.

Subproblem 1

w + -4 = 9.38083152 Simplifying w + -4 = 9.38083152 Reorder the terms: -4 + w = 9.38083152 Solving -4 + w = 9.38083152 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + w = 9.38083152 + 4 Combine like terms: -4 + 4 = 0 0 + w = 9.38083152 + 4 w = 9.38083152 + 4 Combine like terms: 9.38083152 + 4 = 13.38083152 w = 13.38083152 Simplifying w = 13.38083152

Subproblem 2

w + -4 = -9.38083152 Simplifying w + -4 = -9.38083152 Reorder the terms: -4 + w = -9.38083152 Solving -4 + w = -9.38083152 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + w = -9.38083152 + 4 Combine like terms: -4 + 4 = 0 0 + w = -9.38083152 + 4 w = -9.38083152 + 4 Combine like terms: -9.38083152 + 4 = -5.38083152 w = -5.38083152 Simplifying w = -5.38083152

Solution

The solution to the problem is based on the solutions from the subproblems. w = {13.38083152, -5.38083152}

See similar equations:

| 2+(8a+4a)=3 | | z^2+5z+6=0 | | b(2b-3)=0 | | 17s+s=-52 | | 10y-12=1y | | y-84=5y | | h-17h=-60 | | 0.6+3= | | 5p-3= | | 6x-12+4=15x-3 | | |2x+4|=10 | | 4X^2+5X=26 | | k+3k-54=0 | | 1x+1=2x-2 | | a^2+10a+25= | | 4(x-3)=7(x+2) | | 7x-2=2x-29 | | 5x^2-x+3=0 | | 3s-9= | | 3f-(-8)=28 | | 1.6+8= | | y+(y+4)(-4)=y-4 | | 1x+1=2x-1 | | 5m-8= | | 25x+y=180 | | (2w-5)(3w+7)= | | 4(3w+2)-5(6w-1)=2(w-8)-6(7w-4)+4w | | 11=3a+2 | | -8(z+4)+5z= | | c=p+b+2a | | =c+b+2a | | 5n+6=n |

Equations solver categories