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QuickMath Automatic Math Solutions
Hey guys, first post here (hopefully the last) - in a good way
Anyway, I'm doing a mail-in correspondance course for grade 12 college math, and I have to have this thing completed within the next day. I breezed through 19 of 20 lessons, and now my arch enemy has returned.
I don't know if its so much that I can't understand it, as it is just very poorly demonstrated and explained in the book here (having no teacher certainly makes things harder). Anyway, I got about 9 questions here that I need you folks to help me out with. I'm just gonna scan em' right from the book.
There you go, I need help with #83-#85. Any help is welcomed.
83 (c) Factor
Then and , so we try the factors
of for and and the factors of for and .
If you run through all of these you wil be here all day.
A short cut is to use the quadraic formula since if:
then the roots of are and , but the roots are:
So we try and , and we find that:
84 (a) Factor
This is the difference of two squares and you should know the factorisation
of such expressions:
84 (b) Factor
is like 83 (c), but as is prime we know if this has a "nice" factorisation it is of the form:
and trial and error will quickly show that: