2x^2=14x-21

Simple and best practice solution for 2x^2=14x-21 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=14x-21 equation:


Simplifying
2x2 = 14x + -21

Reorder the terms:
2x2 = -21 + 14x

Solving
2x2 = -21 + 14x

Solving for variable 'x'.

Reorder the terms:
21 + -14x + 2x2 = -21 + 14x + 21 + -14x

Reorder the terms:
21 + -14x + 2x2 = -21 + 21 + 14x + -14x

Combine like terms: -21 + 21 = 0
21 + -14x + 2x2 = 0 + 14x + -14x
21 + -14x + 2x2 = 14x + -14x

Combine like terms: 14x + -14x = 0
21 + -14x + 2x2 = 0

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

Divide each side by '2'.
10.5 + -7x + x2 = 0

Move the constant term to the right:

Add '-10.5' to each side of the equation.
10.5 + -7x + -10.5 + x2 = 0 + -10.5

Reorder the terms:
10.5 + -10.5 + -7x + x2 = 0 + -10.5

Combine like terms: 10.5 + -10.5 = 0.0
0.0 + -7x + x2 = 0 + -10.5
-7x + x2 = 0 + -10.5

Combine like terms: 0 + -10.5 = -10.5
-7x + x2 = -10.5

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = -10.5 + 12.25

Reorder the terms:
12.25 + -7x + x2 = -10.5 + 12.25

Combine like terms: -10.5 + 12.25 = 1.75
12.25 + -7x + x2 = 1.75

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
(x + -3.5) equal to 1.322875656 and -1.322875656.

Subproblem 1

x + -3.5 = 1.322875656 Simplifying x + -3.5 = 1.322875656 Reorder the terms: -3.5 + x = 1.322875656 Solving -3.5 + x = 1.322875656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 1.322875656 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 1.322875656 + 3.5 x = 1.322875656 + 3.5 Combine like terms: 1.322875656 + 3.5 = 4.822875656 x = 4.822875656 Simplifying x = 4.822875656

Subproblem 2

x + -3.5 = -1.322875656 Simplifying x + -3.5 = -1.322875656 Reorder the terms: -3.5 + x = -1.322875656 Solving -3.5 + x = -1.322875656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -1.322875656 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -1.322875656 + 3.5 x = -1.322875656 + 3.5 Combine like terms: -1.322875656 + 3.5 = 2.177124344 x = 2.177124344 Simplifying x = 2.177124344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.822875656, 2.177124344}

See similar equations:

| X^2+2x+19=-9x+1 | | 50+6x=26 | | 4(3m-1)=2(5m+7) | | 14x-3=1-x+1 | | 5-8(a+2)=7+a | | a^2+14a+33= | | 13y-2(y-2)=26 | | -3x-x+1x+1.5x+3x-35x-8x+24x=-3+2+3-0+9+6+54-8-21.3 | | x-4=10-6 | | 2x-7y=9 | | 8m+4=9 | | 4x-8=6x-14 | | x^2+1.73x-1=0 | | 3x-5=10x-68 | | w^2-8w-4=0 | | 4-x=10-6 | | Z=(88)+(25) | | -2.1q-1=-1 | | 4.7+2g=7.3 | | 3(y-5)=-6 | | 3b-2.5=5 | | 3x+13=9-5x | | x^2+1.73-1=0 | | 2x-8=3x-7 | | 0.4u+1=6.6 | | -8=8-2c | | 150-4x=41x+20 | | 0.16666667k=8 | | 2x+15=7x+11 | | 8(3p-6)=-25+p | | 4x+11=-101-10x | | y^2+4y-53=0 |

Equations solver categories