Question

Melengkapi kuadrat sempurna
1. x2 + 14x + 49 = 0
2. 9x2 - 25 = 0
3. (y+1)2 - 9 = 0

Answer 1

1. (x + 7)(x + 7) = 0
    x = -7
2. (3x - 5)(3x + 5) = 0
    x = 5/3 atau x = -5/3
3. ((y+1) - 3)((y+1) + 3) = 0
    (y - 2)(y + 4) = 0
    y = 2 atau y = -4