himpunan penyelesaian sistem persamaan y=2x²+2x-5 y=x²-3x+1

jawab


y = 2x² + 2x - 5
y = x² - 3x + 1
.........................(-)
0 = x² + x - 6
(x + 3)(x - 2) = 0
x = - 3  atau x = 2

x= - 3 , y = x² -3x + 1
y = (-3)² - 3(-3) + 1
y = 19
(x,y) = (-3, 19)

x = 2 , 
y = (2)² - 3(2) + 1
y = - 1
(x,y)= (2,-1)

HP {(-3, 19), (2, -1) }