3x^2+8x=-13

Simple and best practice solution for 3x^2+8x=-13 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 3x^2+8x=-13 equation:


Simplifying
3x2 + 8x = -13

Reorder the terms:
8x + 3x2 = -13

Solving
8x + 3x2 = -13

Solving for variable 'x'.

Reorder the terms:
13 + 8x + 3x2 = -13 + 13

Combine like terms: -13 + 13 = 0
13 + 8x + 3x2 = 0

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

Divide each side by '3'.
4.333333333 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '-4.333333333' to each side of the equation.
4.333333333 + 2.666666667x + -4.333333333 + x2 = 0 + -4.333333333

Reorder the terms:
4.333333333 + -4.333333333 + 2.666666667x + x2 = 0 + -4.333333333

Combine like terms: 4.333333333 + -4.333333333 = 0.000000000
0.000000000 + 2.666666667x + x2 = 0 + -4.333333333
2.666666667x + x2 = 0 + -4.333333333

Combine like terms: 0 + -4.333333333 = -4.333333333
2.666666667x + x2 = -4.333333333

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = -4.333333333 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = -4.333333333 + 1.777777780

Combine like terms: -4.333333333 + 1.777777780 = -2.555555553
1.777777780 + 2.666666667x + x2 = -2.555555553

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = -2.555555553

Can't calculate square root of the right side.

The solution to this equation could not be determined.

See similar equations:

| 3x+26=6x+5 | | 14x-160=20x-10 | | (-37)+x=5 | | N-12n-24=101 | | 1m+9=12m-8m+21 | | 3x+26+6x+5=180 | | 4(y+5)+y=3(y+4)+6 | | x=1/2a*t^2 | | 52+x=65 | | 5/9x3/10 | | 24/1 | | 3x+26+6x+5=360 | | 4.3=x+3 | | 6x-3+2x=5x+9 | | X+29=48 | | 62.1=(20+.5x)+.15(20+.5x) | | M+9=12m-8m+21 | | 24-3w=7w+64 | | 2(-2b+5)-5b=-20+6b | | -(-2w-31)=30 | | -9(4x-2)=108-16 | | (a^3-2a^2)-(3a^2-4a^2)= | | 100000=x-.08x-260000 | | (X-2)-2(x-1)=(x+1)-(x-6) | | 46=47+1x | | cos(3x)=10x^2 | | 1260/m=20 | | 1260/m=20 | | 7x+5=8-x | | 2x+0.2=x-3 | | 80h-2=15 | | 2(x-6)=7x |

Equations solver categories