|2×+6|=|×-4|
help yg nomor 2 pakai cara 1 dan 2 seperti nomor 1
Nilai Mutlak
cara 1
|2x + 6| = |x – 4|
•
2x + 6 = x – 4
2x – x = -4 – 6
x = -10
•
2x + 6 = -(x – 4)
2x + x = 4 – 6
3x = 2
x = 2/3
Nilai x :
-10 dan 2/3
cara 2
|2x + 6| = |x – 4|
(2x + 6)² = (x – 4)²
(2x + 6)² – (x – 4)² = 0
(2x + 6 + x – 4)(2x + 6 – (x – 4)) = 0
(3x – 2)(x + 10) = 0
x = 2/3 atau x = -10
Nilai x :
-10 dan 2/3
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