If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(r+9)(r+3)=-8
We move all terms to the left:
(r+9)(r+3)-(-8)=0
We add all the numbers together, and all the variables
(r+9)(r+3)+8=0
We multiply parentheses ..
(+r^2+3r+9r+27)+8=0
We get rid of parentheses
r^2+3r+9r+27+8=0
We add all the numbers together, and all the variables
r^2+12r+35=0
a = 1; b = 12; c = +35;
Δ = b2-4ac
Δ = 122-4·1·35
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{4}=2$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-2}{2*1}=\frac{-14}{2} =-7 $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+2}{2*1}=\frac{-10}{2} =-5 $
| -3=n/4-6 | | 7/8-3/4=k | | r/2+5=-5 | | r/2+5=5 | | 4=b/4+2 | | 3*1/4=k | | b/3-6=-1 | | -0.3y=2.1 | | m/5+7=9 | | 52,800+43,757+121,113+57,532+44,471+h=354,386 | | -0.5-0.3y=2.1 | | 4(2y+3)=84 | | 78-v=292 | | 5+4y=54-3y | | -8y−3.74=-8.3y−6.26 | | -10-3x=35 | | 4y-6=2y+30 | | -86=-6-4x | | 9-(2z-3)=5-3z | | 0.5-0.3y=2.1 | | 38-10x=10-4x | | 10=n/18=9 | | 94=-2y-6+12y | | 17k+3-8=18k+14 | | 22=1-7x | | 3y+5+4y=40 | | -5=-4+m/16 | | 95=5+3y | | -9(x+6)+4(1-5x)=-30(x+1)-5 | | -6=x/2-3 | | 5x+2.6=9.6 | | (x+2)^2-x^2=20 |