Question

No 123 tulisin caranya

Answer 1

1. x=2
= 3(2)^3 + (2)^2 - 4(2) -2
= 24 + 4 - 8 - 2
= 18
2. pake bagi kurung
2x^3 - x^2 + 3x - 1 : x+2
susah ngetiknya
2x^3 : x = 2x^2
2x^2 kali x = 2x^3
2x^2 kali 2 = 4x^2
2x^3-2x^3 habis
-x^2 - 4x^2 = -5x^2
terus -5x^2 bagi x = -5x
-5x kali x = -5x^2
-5x kali 2 = -10x
-5x^2-(-5x^2)= habis
3x + 10x = 13x
13x : x = 13
13 kali x= 13x
13 kali 2 = 26
-1 - 26 = -27 (sisa pembagian)
3. 3x^4 - 5x^3 + 7x^2 - 9x + 5 : 3x+1
bagi kurung
3x^4 bagi 3x = x^3
x^3 kali 3x= 3x^2
x^3 kali 1= x^3
3x^2-3x^2 abis
-5x^3-x^3= -6x^3
-6x^3 dibagi 3x = -2x^2
-2x^2 x 3x= -6x^3
-2x^2 x 1 = -2x^2
7x^2+2x^2= 9x^2
9x^2 : 3x = 3x
3x kali 3x = 9x^2
3x kali 1 = 3x
9x^2 - 9x^2 abis
-9x - 3x = -12x
-12x bagi 3x = -4
-4 kali 3x= -12x
-4 kali 1 = -4
-12+12= 0
5+4 = 9 (E)