Question

Tolong yang bisa langsung jawab.!!

Answer 1

1)
|x+7|² - 3| x + 7| - 4 = 0
misalkan |x+7| = a
a² - 3a - 4 = 0
(a -4)(a+1) = 0
a = 4  atau a = - 1

|x+ 7| = 4 atau |x + 7| =  -1 (tm)
x + 7 = 4 atau x + 7 = -4
x = - 3  atau x  = - 11
..
2)
|x - 7| - | x-2| = 3

a) x - 7 > 0  atau  x -2 < 0
x - 7 - (2-x) = 3
x - 7 - 2 + x = 3
2x -9 = 3
2x =  12
x = 6 tidak memenuhi

b) x - 7 < 0 atau x - 2 > 0
7 - x - (x -2) =3
7 - x - x + 2 = 3
-2x + 9 = 3
-2x = -6
x = 3

hp x = 3