Laura

- anonymous

Laura

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- anonymous

|dw:1327468722698:dw| The figure is a right square. Solve for x.

- anonymous

so it would be (4x^2 + x - 37) * (-x^2 +x +43) right?

- anonymous

yes! :)

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- anonymous

Sorry, I can't write with a mouse very well

- anonymous

You have to just multiply it all out. So start with the first term and multiply it. I'll get you started

- anonymous

Or, rather, use the distributive property

- anonymous

I do know that it is 4x^2+x-37=x^2+x+43
Is it?

- anonymous

sorry, I gave you the equation for area. Hold on. Do you know the area?

- anonymous

Yes, it is lw right?

- anonymous

is this how it was originally set up? I think we're missing some info

- anonymous

Sorry for the hassle! and this is all there is

- anonymous

You're right, it would be lw, but we have nothing to equal lw to!

- anonymous

hmmm

- anonymous

It says: "The figure in the diagram is regular. Solve for x and find the perimeter."

- anonymous

regular meaning all angles and sides are congruent

- anonymous

You're right, set the two trinomials equal to each other! So Start with that

- anonymous

4x^2+x-37=x^2+x+43

- anonymous

don't forget the (-) in front of x^2

- anonymous

4x^2+x-37=-x^2+x+43
And then I am stuck at this point

- anonymous

ok, well, add x^2 to both sides. what do you get?

- anonymous

3x^2+x-37=x+43

- anonymous

add, not subtract

- anonymous

Oops, sorry! 5x^2+x-37=x+43

- anonymous

oK good. Now let's tackle the x terms. What should you do?

- anonymous

do they cancel out?

- anonymous

yep!!

- anonymous

so what's next?

- anonymous

so 5x^2=80?

- anonymous

yep!! great job

- anonymous

next step?

- anonymous

divide by 5?

- anonymous

for 80

- anonymous

yep

- anonymous

oh and x=4??

- anonymous

yep!

- anonymous

so what's the perimeter?

- 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

124 units!

- anonymous

You're welcome!

- anonymous

is it correct?

- anonymous

yep!

- anonymous

I think you got it!

- anonymous

ok thanks again :) hope you have a good night!

- anonymous

you too!

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