ImmanuelSinaga
Tinggal masukkan nilai nya a. sumbu x --------=> jika y = 0 x² + 0 + 8x - 0 + 20 = 0 x² + 8x - 20 = 0 (x+10)(x-2) = 0 titik (-10,0) dan (2,0) b. sumbu y -------=> jika x = 0 0 + y² + 0 - y - 20 = 0 y² - y - 20 = 0 (y-5)(y+4) = 0 titik (0,5) dan (0,-4) c. y = x -1 x² + (x-1)² + 8x - (x-1) - 20 = 0 x² + x² - 2x + 1 + 8x - x + - 20 = 0 2x² + 5x - 18 = 0 (2x+9)(x-2) = 0 x = -9/2 ------------=> y = x - 1 = -11/2 x = 2 ------------=> y = x - 1 = 1
a. sumbu x --------=> jika y = 0
x² + 0 + 8x - 0 + 20 = 0
x² + 8x - 20 = 0
(x+10)(x-2) = 0
titik (-10,0) dan (2,0)
b. sumbu y -------=> jika x = 0
0 + y² + 0 - y - 20 = 0
y² - y - 20 = 0
(y-5)(y+4) = 0
titik (0,5) dan (0,-4)
c. y = x -1
x² + (x-1)² + 8x - (x-1) - 20 = 0
x² + x² - 2x + 1 + 8x - x + - 20 = 0
2x² + 5x - 18 = 0
(2x+9)(x-2) = 0
x = -9/2 ------------=> y = x - 1 = -11/2
x = 2 ------------=> y = x - 1 = 1