anonymous
  • anonymous
what type of right triangle is this if: a=90, b=y+40, c=3y-10
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
im assuming a,b,and c are degrees. then b+c=90
anonymous
  • anonymous
Well, no they are all side measurements
anonymous
  • anonymous
and also, i am figuring for y.

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anonymous
  • anonymous
is a the hypotenuse?
anonymous
  • anonymous
no, c is.
anonymous
  • anonymous
then c^2 - b^2 = a^2
anonymous
  • anonymous
do that and the quadratic formula to solve for y
anonymous
  • anonymous
Yes, the pythagorean theorem... and to tell the truth i have absolutely no idea what that means
anonymous
  • anonymous
what does "that" refer to?
anonymous
  • anonymous
"that" refers to do that and the quadratic formula to solve for y
anonymous
  • anonymous
just plug in everything you know into the pythagorean theorem. then rearrange what you get so that you can use the quadratic formula.
anonymous
  • anonymous
(3y-10)^2 - (y+40)^2 = 90^2
anonymous
  • anonymous
well.... i did the same thing except i used a squared plus b squared equals c squared
anonymous
  • anonymous
that works too
anonymous
  • anonymous
now just rearrange it all so that everything is on one side of the equation
anonymous
  • anonymous
okay but i dont come up with y being a perfect square.
anonymous
  • anonymous
i tried this: a=90,b=y+40,c=3y-10 a2+b2=c2 squared=2 so 902+(y+40)2=(3y-10)2 8100+y2+1600=3y2+100 9700+y2=3y2+100 9600+y2=3y2=2y2+100 9600=2y2 4800=y2
anonymous
  • anonymous
you squared incorrectly. (y+40)^2 is y^2+80y+1600. same with (3y-10)^2, that was squared incorrectly too
anonymous
  • anonymous
how do you get 80y?
anonymous
  • anonymous
use the foil method.
anonymous
  • anonymous
please elaborate....
anonymous
  • anonymous
hmmm. write out (y+40)x(y+40). then distribute. so it becomes y*y + y*40 + 40*y + 40*40
anonymous
  • anonymous
ooooohhhhh!!!! okay genius.... (in a good way) thank you so much!
anonymous
  • anonymous
lol no problem. by the way, the answer isn't a whole number.
anonymous
  • anonymous
I'm in seventh grade honors and lets just say my teacher isnt exactly very to the point. and oh are you serious? so its not a perfect square?
anonymous
  • anonymous
nope =(
anonymous
  • anonymous
ohhh jeez. i was having a hard time the whole time because i thought it HAD to be a perfect square... :) whoops.
anonymous
  • anonymous
lol.

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