Question

X2 + 5x + 6 = 0 dengan melengkapi kuadrat sempurna

Answer 1

X² + 5x + 6 =0
kuadrat sempurna ==> yg diganti c
x² + 5x + (25/4 -1/4) = 0
x² + 5x +25/4 -1/4 = 0
x²+5x+25/4 = 1/4
(x+5/2)² = (+/-1/2)²
x + 5/2 =+/- 1/2
x1 =1/2-5/2 = -4/2 =-2
x2 = -1/2-5/2 = -6/2 = -3