If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(2x+15)(x-2)=0
We multiply parentheses ..
(+2x^2-4x+15x-30)=0
We get rid of parentheses
2x^2-4x+15x-30=0
We add all the numbers together, and all the variables
2x^2+11x-30=0
a = 2; b = 11; c = -30;
Δ = b2-4ac
Δ = 112-4·2·(-30)
Δ = 361
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{361}=19$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-19}{2*2}=\frac{-30}{4} =-7+1/2 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+19}{2*2}=\frac{8}{4} =2 $
| 4x^2+40+75=150 | | 4a=52/5 | | 7/8y-1=-15/16y+4 | | 3(x-5+20=2(x+4) | | 13.25=4p+7(0.75) | | y/3=7/12 | | 13x/4=1/2x+1/4 | | 9-6(4u-1=u+15 | | 2x^2+1=2x+10 | | -12+6x=7x+17 | | -57+4x=36+7x | | 12x-(6×-12)=4+5× | | 40-x^2=-8 | | 71x+x=180 | | 3k+2=5.2 | | 36p^2-24p=0 | | 7x+1=2.1 | | 4-7x-5+8x=14-4x-2x+8 | | 7Xy=1000,000 | | 50x^2+5x-3=(5x-1) | | 5y+7y=12y | | 6x+4(2x+4)=1/2(28+32) | | 20^4x+3=5^3x+4 | | F(2)=5x+6 | | x^2-90x-175=0 | | 17-(4n-5)=-9n-3(n+7) | | x+(2/5x)=-35 | | 9y=4y+45 | | 195=65-x | | 3.29x-2.07=1.79x+12.93 | | 5x(x+12)+2(-x+5)=-15 | | 2x+10=2x^2+1 |