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√(x+6)² = 2x
kuadratkan kedua ruas, get
(x+6)² = 4x²
x² + 12x + 36 = 4x²
3x² - 12x - 36 = 0
x² - 4x - 12 = 0
(x+2)(x - 6) = 0
pembuat nol :
x + 2 = 0 ---------> x = -2
x - 6 = 0 ----------> x = 6
karena x harus positif, maka satu-satunya solusi adalah x = 6
2) 5(x-6)+15-3(x+5) = 4(x-1)
5x-30+15-3x-15 = 4x - 4
2x - 30 = 4x - 4
2x = - 26
x = - 13
3) grafik dari 2x - 3y = -6 adalah E
4) 3(2x+3) - 4(x - 5) = 23
6x + 9 - 4x + 20 = 23
2x + 29 = 23
2x = - 6
x = -3
5) (-2 + 4x)/7 = (x+5)/2
kali silang :
2(-2 + 4x) = 7(x+5)
- 4 + 8x = 7x + 35
8x - 7x = 35 + 4
x = 39