If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(4x+7)(x-3)=12x+21
We move all terms to the left:
(4x+7)(x-3)-(12x+21)=0
We get rid of parentheses
(4x+7)(x-3)-12x-21=0
We multiply parentheses ..
(+4x^2-12x+7x-21)-12x-21=0
We get rid of parentheses
4x^2-12x+7x-12x-21-21=0
We add all the numbers together, and all the variables
4x^2-17x-42=0
a = 4; b = -17; c = -42;
Δ = b2-4ac
Δ = -172-4·4·(-42)
Δ = 961
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{961}=31$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-31}{2*4}=\frac{-14}{8} =-1+3/4 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+31}{2*4}=\frac{48}{8} =6 $
| -32/4=x | | x/5-8=-1 | | -2x7=7 | | -34/8=x | | -w+8=2 | | 8000=35(x)+25(x) | | 2y-8-4y=y^2-2y | | |x-7|+9=4 | | -2.7-3.4d=-24.8 | | 5x^2+10x+27=0 | | x2=-16 | | 4x-4=3x-3,5 | | 4–2s=2 | | 12*2.78^2k=6.5 | | 0.065=a/3.2 | | 2=4–2s | | 0.6(4)+0.4(x)=5.5 | | v=26+24+(-16) | | 100+x3=250 | | x/2-2=3x-30 | | 5(r+3)=2r+6. | | 0.2(4)+0.2(4)+0.4(x)=5.5 | | 3+2.7x=0.6+3.2x | | p/100=3.2 | | (3+5i)(7+2i)=0 | | 100x3=250 | | 20+0,5x=220-0,5x | | 6x-7=3x-67 | | 0.2(4)+0.2(4)+x=5.5 | | -2x+5(x-8)=-70 | | 5x-(2x-14)=40 | | 9.7(x)+4.3(1-x)=7.0 |