anonymous
  • anonymous
Laura
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1327468722698:dw| The figure is a right square. Solve for x.
anonymous
  • anonymous
so it would be (4x^2 + x - 37) * (-x^2 +x +43) right?
anonymous
  • anonymous
yes! :)

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anonymous
  • anonymous
Sorry, I can't write with a mouse very well
anonymous
  • anonymous
You have to just multiply it all out. So start with the first term and multiply it. I'll get you started
anonymous
  • anonymous
Or, rather, use the distributive property
anonymous
  • anonymous
I do know that it is 4x^2+x-37=x^2+x+43 Is it?
anonymous
  • anonymous
sorry, I gave you the equation for area. Hold on. Do you know the area?
anonymous
  • anonymous
Yes, it is lw right?
anonymous
  • anonymous
is this how it was originally set up? I think we're missing some info
anonymous
  • anonymous
Sorry for the hassle! and this is all there is
anonymous
  • anonymous
You're right, it would be lw, but we have nothing to equal lw to!
anonymous
  • anonymous
hmmm
anonymous
  • anonymous
It says: "The figure in the diagram is regular. Solve for x and find the perimeter."
anonymous
  • anonymous
regular meaning all angles and sides are congruent
anonymous
  • anonymous
You're right, set the two trinomials equal to each other! So Start with that
anonymous
  • anonymous
4x^2+x-37=x^2+x+43
anonymous
  • anonymous
don't forget the (-) in front of x^2
anonymous
  • anonymous
4x^2+x-37=-x^2+x+43 And then I am stuck at this point
anonymous
  • anonymous
ok, well, add x^2 to both sides. what do you get?
anonymous
  • anonymous
3x^2+x-37=x+43
anonymous
  • anonymous
add, not subtract
anonymous
  • anonymous
Oops, sorry! 5x^2+x-37=x+43
anonymous
  • anonymous
oK good. Now let's tackle the x terms. What should you do?
anonymous
  • anonymous
do they cancel out?
anonymous
  • anonymous
yep!!
anonymous
  • anonymous
so what's next?
anonymous
  • anonymous
so 5x^2=80?
anonymous
  • anonymous
yep!! great job
anonymous
  • anonymous
next step?
anonymous
  • anonymous
divide by 5?
anonymous
  • anonymous
for 80
anonymous
  • anonymous
yep
anonymous
  • anonymous
oh and x=4??
anonymous
  • anonymous
yep!
anonymous
  • anonymous
so what's the perimeter?
anonymous
  • anonymous
oh okay! Thanks so much, I really appreciate that you didn't leave me even though you wanted to go to bed and for helping me :)
anonymous
  • anonymous
124 units!
anonymous
  • anonymous
You're welcome!
anonymous
  • anonymous
is it correct?
anonymous
  • anonymous
yep!
anonymous
  • anonymous
I think you got it!
anonymous
  • anonymous
ok thanks again :) hope you have a good night!
anonymous
  • anonymous
you too!

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