Question

In triangle ABC shown find BC.
B
(5d - 3)cm
(3d + 7)cm
A
C

Answer 1

22

Explanation:

make the two sides measurements equal. solve for d..

d=5... substitute d in bc formula and u should get 22

Answer 2

BC = 22

Explanation:

Hey There!

So if you see those two red lines on each side of the triangle than that indicates that the sides are congruent to each other so the first step is to right an equation to solve for d and because the sides are congruent the equation would be

5d-3=3d+7 and now we just solve for d

step 1 subtract 3d from each side

5d-3d=2d

3d-3d cancels out

now we have

2d-3=7

step 2 add 3 to each side

-3+3 cancels out

3+7=10

now we have

2d=10

step 3 divide each side by 2

2/2 cancels out

10/2=5

d=5

Now we just plug in 5 for d for side bc

3x5=15

15+7=22

so BC = 22

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