If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(-z+1)(-z+7)=0
We add all the numbers together, and all the variables
(-1z+1)(-1z+7)=0
We multiply parentheses ..
(+z^2-7z-1z+7)=0
We get rid of parentheses
z^2-7z-1z+7=0
We add all the numbers together, and all the variables
z^2-8z+7=0
a = 1; b = -8; c = +7;
Δ = b2-4ac
Δ = -82-4·1·7
Δ = 36
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{36}=6$$z_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-6}{2*1}=\frac{2}{2} =1 $$z_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+6}{2*1}=\frac{14}{2} =7 $
| -20-19w=20-17w | | 11w=-9 | | x/5+3/10=1/2 | | (-z-1)(-z-7)=0 | | 15-13r=-19-14-9r | | 6(X-3)/3=2(x+8)/12 | | -5(2r+3)=3(11–4r)–58 | | 15x-14=10-3x | | 2(3(-3)+5)-2x+2=0 | | 29x+11=29x-1129x+11=29x−11 | | 3.2+10m=6.73 | | 3(x-8)-2x=-1(x+24) | | 10-3x=-x+2(2-x) | | −4x+13=−x+1 | | 5/7x-1=-2/7x+9 | | x-21=-2(-8x+3) | | 2(3y-1)-8=6y-10 | | 14x-17-8x+2=12x+3-x | | 7x+5=7(x+6) | | -z^2+8z=7 | | 7x+5=3(5x-3)-10x | | 115-70=x | | x-21=-2(-8x+3 | | 10u-15=7u | | u-9.88=6.49 | | x³-6=21 | | 41−2x=2+x | | 42÷6=g | | -13y-16=-12-15y+4 | | -243=9(10+w) | | 7(x=1)=8(x-2) | | 4x-8=28* |