Question

Tolong dijawab no. 4 dan 5 PAKAI cara yang lengkap aljabar kelas 7

Answer 1

A)c²-2ac+3ab-b²
=3²-2.(-2).3+3.(-2).4-4²
=9+12-24-16=-19
b)2c(3a-b)
=6ac-2bc
=6.(-2).3 -2.4.3
=(-36)-24=-(60)
c)(2ac-b)³
=(2.-2.3-4)³
=(-12-4)³=(-16)³=(-4096)
d)2c³-a³-b³
=2.3³-(-2)³-4³
=54+8-64=(-2)

Answer 2

4. a=-2
b=4
c=3

a) c"-2ac+4ab-b"
= 3"-2(-2)(3)+4(-2)(4)-4"
= 9-2(-6)+4(-8)-16
= 9+12-32-16
= 21-48
= -27

b) 2c(3a-b)
= 2(3) (3(-2)-4)
= 6 (-6-4)
= 6 (-10)
= -60

c) (2ac-b)"'
= (2(-2)(3)-4)"'
= (2(-6)-4)"'
= (-12-4)"'
= (-16)"'

d) 2c"'-a"'-b"'
= 2(3)"' - (-2)"' - (4)"'
= 2(27) + 8 - 64
= 54+8-64
= -2