2x^2+7x-12=0

Simple and best practice solution for 2x^2+7x-12=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-12=0 equation:


Simplifying
2x2 + 7x + -12 = 0

Reorder the terms:
-12 + 7x + 2x2 = 0

Solving
-12 + 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'.
-6 + 3.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 3.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 3.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 3.5x + x2 = 0 + 6
3.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
3.5x + x2 = 6

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 = 6 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 6 + 3.0625

Combine like terms: 6 + 3.0625 = 9.0625
3.0625 + 3.5x + x2 = 9.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(x + 1.75) equal to 3.010398645 and -3.010398645.

Subproblem 1

x + 1.75 = 3.010398645 Simplifying x + 1.75 = 3.010398645 Reorder the terms: 1.75 + x = 3.010398645 Solving 1.75 + x = 3.010398645 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 = 3.010398645 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 3.010398645 + -1.75 x = 3.010398645 + -1.75 Combine like terms: 3.010398645 + -1.75 = 1.260398645 x = 1.260398645 Simplifying x = 1.260398645

Subproblem 2

x + 1.75 = -3.010398645 Simplifying x + 1.75 = -3.010398645 Reorder the terms: 1.75 + x = -3.010398645 Solving 1.75 + x = -3.010398645 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 = -3.010398645 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -3.010398645 + -1.75 x = -3.010398645 + -1.75 Combine like terms: -3.010398645 + -1.75 = -4.760398645 x = -4.760398645 Simplifying x = -4.760398645

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.260398645, -4.760398645}

See similar equations:

| 4B^2+44B+121=0 | | -9x+25+11x+25=-2 | | -9+25+11x+25=-2 | | .2x=8 | | 20b^2+12b^3=0 | | 5y=-6 | | 4x^18= | | 2a+4(7+5a)= | | .16x=8 | | 4y=22 | | 4x-7=x-4 | | 2x^2+30x+108= | | lnx+lnx^2=3 | | 6.5x-2x=1.3x+1 | | 3(4x+3)=3(x+2) | | x+2y=6y=x+3 | | 7x-5=6x-6 | | 14m(m-2)= | | 2(4x+5)=4(x+2) | | .35= | | 0=x^3-4x^2+5x-3 | | .6x=-38 | | 4x-4x=-28 | | 3x+3*3x+3=36 | | 5a+4(3a-8)=5+13a | | 3m(m-5)=0 | | 100=4x^4 | | +12+-4=-10 | | +12+-4= | | .5x=.7x+.4 | | 5-1/2(1x-6)=4 | | 2(5x+1)=3x-21 |

Equations solver categories