Tolong dibantu ya 10-20

10) (x-3)(x+8)
= x^2+8x-3x-24
= x^2+5x-24
11) 4x-3>x+12
3x>15
x>5
hp = {6,7,8}
12) 2(x+8) = 4 (x+2)
2x+16=4x+8
2x=8
x=4
panjang = x+2 = 6 cm
13) P = {1,3,5,7,9,11}
Q= { 7,11}
P iris Q = {7,11}
14) c