Question

Tlong jwab y nmr 3&5 tlong banget

Answer 1

3. |a| = |a - 4|
=> a^2 = (a - 4)^2
=> a^2 = a^2 - 8a + 16
=> 8a = 16
=> a = 2

5.|4x - 2| ≤ |x + 5|
=> (4x - 2)^2 ≤ (x + 5)^2
=> 16x^2 - 16x + 4 ≤ x^2 + 10x + 25
=> 15x^2 - 26x - 21 ≤ 0
=> (3x - 7)(5x + 3) ≤ 0
=> x = 7/3 atau x = -3/5
garis bilangan
+++ [-3/5] --- [7/3] +++
-3/5 ≤ x ≤ 7/3