Tentukan penyelesaian tiap persamaan kuadrat berikut dengan melengkapi kuadrat x²+2x-3=0
x² + 2x – 3 = 0
(x + 2/2.1)² = -(-3)/1 (2/2.1)²
(x + 2/2)² = 3 (2/2)²
(x + 2/2)² = 3 4/4
(x + 2/2)² = 4
x + 1 = akar 4
x +1 = +- 2
x + 1 = -2
x = -2 -1
x1 = -3
x + 1 = 2
x = 2 – 1
x = 1
semoga membantu
Penjelasan dengan langkah-langkah:
- X^2 + 2x – 3 = 0
- x^2 + 2x +1 = 3 + 1
- (x + 1)^2 = 4
- x + 1 = +- (2)
- x = -2 – 1
- = -3 dan
- x = 2 – 1
- = 1