Question

If the measure of (ac) is 40 cm, the measure of (ab) is (2x + 4) cm, and point b is the midpoint of (ac), then x is

Answer 1

Answer:

8 cm.

Step-by-step explanation:

AC = 40 cm.

AB = 2x + 4 cm.

B is midpoint of AC => AB = 20 cm.

=> 2x  + 4 = 20

=> 2x = 16

=> x = 8

Answer 2

Answer:

8

Step-by-step explanation:

$abc \: is \: a \: line \: where \: b \: is \: midpoint \\so \: ab = bc = 20cm \: as \: ac = 40cm \\ now \: ab = 2x + 4 \\ also \: ab = 20cm \\ therefore 2x + 4 = 20 \\ 2x = 20 - 4 \\ 2x = 16 \\ x = \frac{16}{2} \\ x = 8$