for number 5:
ok, you first set everything equal to zero, as i did above, then you look at the last term, and think: are there any factors of -24 that will add up to 23. YES there are :D these two factors will be 24 and -1. so, to factor this:
like so. :)
you just plug in the factors. Note that this will only work when the coefficient of the first variable is 1 (see how
is by itself? this will only work if
has no coefficient.
Now you set y-1 equal to zero. So, y-1=0, and y=1. you do the same for y+24. Y+24=0 Y=-24. So, Y=1 and Y=-24.
for number 7: you will use the distributive property.
Note, if you set 2x+1 equal to zero, and solve, you will get -1/2 this is also a solution.
You will distribute the number outside of the parenthesis to the numbers in the parenthesis. This means you will multiply 3x by 2x and by 1. so you get: