tolong yang bisa jawab yaaa

x / 6 = (3+x) / 10
10x = 6(3+x)
10x = 18 + 6x
10x - 6x = 18
4x = 18
x = 18/4
x= 4,5

Mapel : Matematika
Kelas : IX SMP
Bab : Kesebangunan

Pembahasan :
7.

6/(6 + 4) = x/(x + 3)
6/10 = x/(x + 3)
3/5 = x/(x + 3)
3(x + 3) = 5x
3x + 9 = 5x
5x - 3x = 9
2x = 9
x = 9/2
x = 4,5 cm

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9.

AD² = CD x BD
6² = 9 x BD
36 = 9BD
BD = 36/9
BD = 4 cm