If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(n+7)(4n-3)=0
We multiply parentheses ..
(+4n^2-3n+28n-21)=0
We get rid of parentheses
4n^2-3n+28n-21=0
We add all the numbers together, and all the variables
4n^2+25n-21=0
a = 4; b = 25; c = -21;
Δ = b2-4ac
Δ = 252-4·4·(-21)
Δ = 961
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{961}=31$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(25)-31}{2*4}=\frac{-56}{8} =-7 $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(25)+31}{2*4}=\frac{6}{8} =3/4 $
| 8(x-2)-3x=4 | | t÷6-1=14 | | 6x(400,000)=10x | | (x-5)2-15=(x-2)2 | | 2(x+4)=4+4(x-2)-2x | | X+(2x+80)+4x+(5x+40)=360 | | -8(7+2x)=4 | | 7x+56=14 | | O.66=0.6x1.1 | | x-3=0,5x+1 | | (X-5)+(2x-35)+5x=360 | | 13x+10=9x+3 | | 3x+4x/3=65 | | 9x-8=14-2x | | 6(x+1)-5=3(x+4)+11 | | 5+x=(1/2)-(1/3) | | 2y−3=11 | | 16k+4+16k-16k^2=0 | | 4b+(b-15)+(2b+95)=360 | | 5^{x}+5^{-x-1}=6/5 | | 2x+4x-x=150 | | 4b+(b-5)+(2b+95)=360 | | y=6(y-8/6)-6/5 | | 3x/2=8(4x-7) | | 3,2(2-3y)=3(0,8y-1)+3,4 | | 25-4x=6x+3 | | 2x=8(4x/3-7) | | 5x-80=x+80 | | 8x=4x/3-9 | | 5y-2+y-6=-9y+10+6y13 | | 3x/2=8+(4x+1) | | 2(x+8)=5(x-6) |