Answer:
B is 6.
Step-by-step explanation:
We are trying to find a value for 
such that:
is true for every 
.
So let's choose 
:
Divide both sides by -8:
Note: I didn't want to choose y to be 0 because the value of B would disappear from the equation. So you should be able to have chosen any x and y except for y=0 to solve the equation for B.
Check:
So let's check and use foil to multiply out the right hand side.
There was a 2 in front of that multplicapltiation:
This is exactly what we have on the left hand side of your given equation.
18x² - 60x + 50
= 2 (9x² - 30x + 25 ) ⇒⇒⇒ take 2 as common from all terms
note: 9x² = 3x * 3x and 25 = 5*5 and 3x * 5 *2 = 30x
so, this is a complete square
= 2(3x-5)(3x-5)
= 2(3x-5)²
When you multiple a whole you just multiple straight across when you multiple a decimal you you go from right to left starting with the first number on the right then go to the top next then the next then take the next number on the bottom and do the same thing
Hope this helps you
420 trees
210 minutes in 3 1/2 hours
x2 per minute
=420 trees in 3 1/2 hours
