tlg kerjakan sial Q bsk udah di kumpulin

4) b. 4/2-√5
= (4 / 2-√5)(2+√5 / 2+√5)
= 4(2+√5) / (2-√5)(2+√5)
= 8 + 4√5 / 4 + 2√5 - 2√5 - (5)
= 8 + 4√5 / 4 - 5
= 8 + 4√5 / -1
= -2 (4 + 2√5)

6). a. |x-7| = 3
*|x-7| = 3
(x-7) = 3
x = 3+7
x = 10

*|x-7| = 3
-(x-7) = 3
-x + 7 = 3
-x = 3-7
x = -4/-1
x = 4 maka x1 = 10 dan x2 = 4 {10, 4}

b. |x-2| ≤ 3
*|x-2| ≤ 3
(x-2) ≤ 3
x ≤ 3+2
x ≤ 5

*|x-2| ≤ 3
-(x-2) ≤ 3
-x + 2 ≤ 3
-x ≤ 3-2
x ≤ -1 maka x1 = 5 dan x2 = -1 {5, -1}