Question

Bantu dong, gw relain semua point gw

Answer 1

1) x^2-2x+3 = x^2-x-2
x^2-x^2-2x+x+3+2=0
-x+5 = 0
-x = -5
x = 5
2) -x^2 = x^2 + 2x + 1
-x^2 - x^2 - 2x - 1 = 0
-2x^2 - 2x - 1 =0
x1 = (-b + akar (b^2 -4ac))/2a
x1 = (2+ akar (4-8))/(-4)
x1 = (2 + akar (-4))/ (-4)

x2 = (-b - akar (b^2 -4ac))/2a
x2 = (2 - akar (4-8))/(-4)
x2 = (2 - akar (-4))/(-4)

3) 2x^2 + y^2 = 17 persamaan1
x^2 + 2y^2 = 22
x^2 = 22-2y^2 persamaan2
masukkan persamaan2 ke persamaan2
2(22-2y^2)+y^2 = 17
44-4y^2+y^2 = 17
-3y^2 = -27
y^2 = 9
y = akar 9
y = 3 atau -3

untuk y = 3, masukkan ke persamaan2
x^2 + 2y^2 = 22
x^2 + 2(3^2) = 22
x^2 = 22-18
x^2 = 4
x = akar 4
x = 2 atau -2

4) gambar tidak jelas.