Kuis +50:
-5x²+10x+20 = 0
Lanjutin dgn melengkapkan kuadrat sempurna![]()
-5x²+10x+20 = 0
Lanjutin dgn melengkapkan kuadrat sempurna
Jawaban:
Persamaan kuadrat
-5x² + 10x + 20 = 0 --> x (-1)
5x² - 10x - 20 = 0 ---> x (1/5)
x² - 2x - 4 = 0
a = 1 , b = -2 dan c = -4
..
misal;
d = b/2a
d = -2/2(1) = -2/2 = -1
e = c - (b²/4a)
e = -4 - (-2)²/4(1))
e = -4 - (4/4)
e = -4-1
e = -5
# Perhitungan akar akar
a(x + d)² + e = 0
1(x + (-1))² + (-5) = 0
(x - 1)² - 5 = 0
(x - 1)² = 5
(x - 1) = ±√5
solusi 1 :
(x - 1) = √5
x = 1 + √5
solusi 2:
(x - 1) = -√5
x = 1 - √5
HP = {( 1 + √5 , 1 - √5 )}
[answer.2.content]
