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for the first one, try cross multiplying |dw:1449732602548:dw|
|dw:1449732628434:dw| now try cross multiplying the 10 and the 6
|dw:1449732697104:dw| what is 10 times 6
(x+7) * (11) = 11x+77 10 * 6 = 60
yes|dw:1449732950975:dw| but it looks like your multiple choice doesn't require distribution for the (x+7)(11) part
but it means the same thing :)
my mistake we dont multiply 7x and 11
so the answer would be C
alright so the next one seems scary because of that fraction. but if we multiply the entire equation by a we can get rid of that fraction
now does this look like one of the answer choices?
yup should be the first one :)
is it just one answer or are there others?
hmmm let's check to see if there are more :)
so if we add 5 to both sides I should have this quadratic equation \[a^2+8a+5=0\] in the form of \[ ax^2+bx+c=0\] for a = 1 , b = 8, and c = 5 the discriminant formula \[b^2-4ac\] can be used as a test to determine if the quadratic equation is factorable. If our result is a perfect square then we can factor, if not, then we need to use the quadratic formula to find those roots. \[b^2-4ac\] for a = 1 , b = 8, and c = 5 \[64-20=44\] well that's not a perfect square number, but the question again just states the step needed for the equation the distribution on the second choice is wrong and we can't factor this, so the third choice is out too
the first choice is the only valid step.
ok ty, i have one last question can you help me with it?
http://prntscr.com/9cfh6g this is it
woooooooooo that's a gamble since I haven't done this in a while but I'm assuming that the rectangle on the outside is double the size
so maybe |dw:1449734122942:dw| not 100% sure
would the answer be 5?
cross multiplying gives 4x=20 but yeah I suck at these :/ x would be 5. but again no confidence here XD
its all good illl just go with that answer cx thnx somuch for the help
probably because I studied a bunch of equations that geometry problems don't pop up too often so the techniques fade with time XD
the answer was 7.5 x'D
oh lord D: see what I mean
my discrete math class is doing graph theory blarghhhhhhhh D: geometric proofs are the worst
oh god, math in general is just not my subject xD
next semester I finish my BA in Math.. but I have to take more analysis courses to even be considered for the MA. So dang 5 more courses before entering the MA, but I'm glad that I finally made it XD
lol you should be
but I'm kind of nervous on this final course...presentations. omg
intro to the methods of research :(
dont be nervous you can get it done * says in an inspirational tone of voice*
thanks. I'm doing my presentations on Number Theory because it's my favorite and easy ^^
lmao sounds good