Question

Help ya.. Beserta cara yang jelas..

Answer 1

No 13
5x - 1 = 2x + 11 . nilai x - 1 ?
jadi
5x - 2x = 11 + 1
3x = 12
x = 12/3 = 4

maka nilai x - 1 --> 4 - 1 = 3

Answer 2

Nomor 16.
f(x)= 4x^2 +6x-3
f(-3)= 4. (-3)^2+.(-3)-3
     = 4+9-18-3
     = 13-21
     =-8
nomor 14
A={2,3,5,7}
B={3,5,7}
AUB={2,3,5,7}

nomor15 jawabannya 8, tapi cranya digambar.
nomor13
5x-1=2x+11
5x-2x=11+1
3x  = 12
x=12/3=4
x-1=4-1=3