–18 = –9(z + 81)

Question

–18 = –9(z + 81)

Ruthy · Answer

Multiply 9 wit everything in d bracket u will get -18=-9z-729
Collect like terms
-18+729=-9z 
-711=-9z
Divide both sides by 9 u get ur ans

umm · Answer

Given$$−18=−9(z+81)$$Simplify and distribute$$−18=−9(z+81)$$$$−18=(−9)(z)+(−9)(81)$$$$−18=−9z+−729$$$$−18=−9z−729$$Flip equation$$−9z−729=−18$$Add 729 to both sides$$−9z−729+729=−18+729$$$$−9z=711$$Divide -9 from both sides$$\frac{ -9z }{ -9 }=\frac{ 711 }{ -9 }$$$$z=−79$$ Therefore$$z=−79$$

Ruthy · Answer

$\color{#0cbb34}{\text{Originally Posted by}}$ @Ruthy
Multiply 9 wit everything in d bracket u will get -18=-9z-729
Collect like terms
-18+729=-9z 
-711=-9z
Divide both sides by 9 u get ur ans
$\color{#0cbb34}{\text{End of Quote}}$
U will get 79

darkknight · Answer

@umm you are correct, so are you Ruthy, but imagine this is a problem in a timed test or quiz. Now you want the most efficient way to do this
–18 = –9(z + 81)

$$–18 = –9(z + 81)$$
Divide both sides by -9 so no distributing is necessary
$$2 = (z + 81)$$
$$z=2-81$$
z=???

Only 2 steps and a very easy way also. Hope that helps : )

meatqueen · Answer

thx. It did

Ruthy · Answer

$\color{#0cbb34}{\text{Originally Posted by}}$ @darkknight
@umm you are correct, so are you Ruthy, but imagine this is a problem in a timed test or quiz. Now you want the most efficient way to do this
–18 = –9(z + 81)

$$–18 = –9(z + 81)$$
Divide both sides by -9 so no distributing is necessary
$$2 = (z + 81)$$
$$z=2-81$$
z=???

Only 2 steps and a very easy way also. Hope that helps : )
$\color{#0cbb34}{\text{End of Quote}}$
Ur step is easy bti don't think I can understand dat step

darkknight · Answer

which one? you just divide both sides by -9 then solve for z, 2 steps

Ruthy · Answer

Kk me I understand tnx anyway

eddiedacoolman · Answer

na