Question

3. The diagonals of an isosceles trapezoid ,BD and AC, are labeled 5x and 3x + 40. Find the length of the diagonals. 3. The diagonals of an isosceles trapezoid ,BD and AC, are labeled 5x and 3x + 40. Find the length of the diagonals. @Mathematics

Answer 1

5

Answer 2

how did you get 5

Answer 3

becuz i am awesome

Answer 4

.........

Answer 5

can you please show me how to do it...?

Answer 6

do not second guess me mortal

Answer 7

I guess it to be 20

Answer 8

............ in any other case i would come back at you with disgust for mortals but i really have to get this done so can you please help me

Answer 9

ok i shall help you

Answer 10

i think my work here is done

Answer 11

o.O dear shabeer please help

Answer 12

diagonals of an isosceles trapezoid are equal in length

Answer 13

As this is an isosceles trapezoid the line segments AD and BC are equal in length. So I suppose Diagonal to be equal and 5x = 3x+40. A linear equation in one variable.

Answer 14

5x and 3x + 40.

so 5x = 3x + 40
5x - 3x = 40
x = 40/2
x = 20

Answer 15

so 5x = 5*20 = 100
3x + 40 = 3*20 + 40 = 60 + 40 = 100

Answer 16

Your right, Harikat. I too wanted to type the same thing.

Answer 17

Ohh.... we were working on parallel tracks....☺

Answer 18

lozl the both of u r so cute haha

Answer 19

In your profile : you said you hate math.
It's such an excellent subject. It's my favourite

Answer 20

@Atsie this is a question I am stumbled on.

Answer 21

In this step

5x and 3x + 40.
so 5x = 3x + 40
5x - 3x = 40 In this step why did they switch the equals sign and how do you know its minus not plus. @Atsie
x = 40/2
x = 20

Answer 22

@smartbrain
I gotta go right now, I'll be back in an hour and then I'll answer ok?

Answer 23

I will probably be gone, but sure, that will help explain it. Ill see if somebody else can explain it meanwhile.

Answer 24

@AihberKhan can you possibly explain?

Answer 25

@smartbrain

Okay, so they are simply subtracting \(3x\) from both sides. Since they are subtracting, the positive \(3x\) becomes negative. You see?

Also, they did not switch the equals sign they subtracted \(3x\) from both sides.

Answer 26

How did they conclude that the 3x is to be subtracted from both sides and not the 5x?

Answer 27

If the \(5x\) is subtracted from both sides, then there will only be ONE side!

Because if the \(5x\) was subtracted it would be \(=3x - 40 - 5x\) which simply can't happen.

Answer 28

I see, so you are trying to eliminate the x in the problem? Right?

Answer 29

You are not trying to eliminate it. You are trying to isolate it. :)

@smartbrain

Answer 30

Ok this answers my question. Thank you.

Answer 31

No problem! :)

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