Question

How can i solve to find AB?

Answer 1

17

Explanation:

AB + BC = AC.

Therefore,

`(3x+2)+(5x+7)=49`

Remove brackets:

`3x+2+5x+7=49`

Add up terms:

`8x+9=49`

Subtract 9 from both sides:

`8x+9-9=49-9`

`8x=40`

Divide both sides by 8:

`(8x)/(8)=(40)/(8)`

`x=5`

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`AB=3x+2=3(5)+2=15+2=17`