Answer:
ok
Step-by-step explanation:
ok
A b + a c - 4 b - 4 c = a ( b + c ) - 4 ( b + c ) =
= (b + c) (a - 4)
Answer:
x=2
Step-by-step explanation:
Answer:
x = -30
cos(x - 30) = ½
Step-by-step explanation:
Look at the picture
Answer:
x=-1 1/2,x=-1.5
Step-by-step explanation: x=-3/2