Question

Melengkapi kuadrat sempurna x2+7x+12=0
mohon bantuanya ^^ ket: x2 (x kuadrat)

Answer 1

X² + 7x + (7/2)²  - (7/2)² + 12 = 0
(x + 7/2)² - 49/4 + 12 = 0
(x + 7/2)² - 1/4 = 0
(x + 7/2)² = 1/4
x + 7/2 =  + 1/2
x = -7/2 - 1/2        atau  x = -7/2 + 1/2
x = -8/2 = -4                         x = -6/2 = -3

Answer 2

X² + 7x = -12
x² + 7x + (7/2)²  = -12 + (7/2)²
(x + 7/2)² = 1/4
x + 7/2 = + √1/4
x + 7/2 =  + 1/2
x = -7/2 - 1/2     <=--------=>   x = -7/2 + 1/2
x = -8/2 = -4      <=--------=>   x = -6/2 = -3