Question

X2 - 3x - 18 = 0 dengan melengkapi kuadrat sempurna , tolong donk aku butuh jawaban dibuat sekarang

Answer 1

X^2 - 3x - 18 = 0
=> x^2 - 3x = 18 ..... kedua ruas ditambah 9/4
=> x^2 - 3x + 9/4 = 18 + 9/4
=> (x - 3/2)^2 = 81/4
=> x - 3/2 = ±9/2
=> x = ±9/2 + 3/2
=> x = 9/2 + 3/2 atau x = -9/2 + 3/2
=> x = 6 atau x = -3