Tolong dibantu nomor 9 dg cara ya. makasih
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=> (2x + 5)^2 ≤ (x + 3)^2
=> 4x^2 + 20x + 25 ≤ x^2 + 6x + 9
=> 3x^2 + 14x + 16 ≤ 0
=> (3x + 8)(x + 2) ≤ 0
=> x = -8/3 atau x = -2
+++ (-8/3) --- (-2) +++
-8/3 ≤ x ≤ -2