2x^2-7x-66=0

Simple and best practice solution for 2x^2-7x-66=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 2x^2-7x-66=0 equation:


Simplifying
2x2 + -7x + -66 = 0

Reorder the terms:
-66 + -7x + 2x2 = 0

Solving
-66 + -7x + 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'.
-33 + -3.5x + x2 = 0

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + -3.5x + 33 + x2 = 0 + 33

Reorder the terms:
-33 + 33 + -3.5x + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + -3.5x + x2 = 0 + 33
-3.5x + x2 = 0 + 33

Combine like terms: 0 + 33 = 33
-3.5x + x2 = 33

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 33 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 33 + 3.0625

Combine like terms: 33 + 3.0625 = 36.0625
3.0625 + -3.5x + x2 = 36.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 36.0625

Calculate the square root of the right side: 6.005206075

Break this problem into two subproblems by setting 
(x + -1.75) equal to 6.005206075 and -6.005206075.

Subproblem 1

x + -1.75 = 6.005206075 Simplifying x + -1.75 = 6.005206075 Reorder the terms: -1.75 + x = 6.005206075 Solving -1.75 + x = 6.005206075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 6.005206075 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 6.005206075 + 1.75 x = 6.005206075 + 1.75 Combine like terms: 6.005206075 + 1.75 = 7.755206075 x = 7.755206075 Simplifying x = 7.755206075

Subproblem 2

x + -1.75 = -6.005206075 Simplifying x + -1.75 = -6.005206075 Reorder the terms: -1.75 + x = -6.005206075 Solving -1.75 + x = -6.005206075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -6.005206075 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -6.005206075 + 1.75 x = -6.005206075 + 1.75 Combine like terms: -6.005206075 + 1.75 = -4.255206075 x = -4.255206075 Simplifying x = -4.255206075

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.755206075, -4.255206075}

See similar equations:

| 48=12x-4y | | -2=b+6 | | (3x^2/5)(2x^1/2) | | 16+8x^2+x^4=0 | | 3y+37+4y=9 | | 4a+-3b=21 | | 2/7=y-4/3 | | (c+8)=(c-5) | | 46.6-6.2x=5.8x+28.6 | | -63=4x-8x-15 | | 20x+14-7+2=3x+8-10+3 | | 7(4x-2)+3=10(3+x)-10-x | | -9w-5+6w=19 | | 33x-13+13x+7=180 | | x+2/3=9/11 | | x+2/3=9/11 | | 25=19-x | | 8x+24=5x+25+2 | | 15=4y-5 | | 9x^2-42xy+49x^2= | | x^2+4x+70=3x^2-5x+35 | | 3+v/4=31 | | 2-15n=15(-3n+2) | | 6=14-x | | -y+101=178 | | 8xy-7xy-11xy= | | 17=211-y | | 22-44=5(x-1)-3 | | -y+274=200 | | y=.625b+10 | | P=a+b+3cfora | | 169-x=222 |

Equations solver categories