Answer:
y=2(x-1)^2 +2
Step-by-step explanation:
+ Because the vertex (1,2), then the equation is y = a(x-1)^2 +2 for a real number a different of 0.
+ And the parabola that passes through (4, 20), we have: x=4, y=20
20=a(4-1)^2 + 2
20= 9a+2
9a=20-2
9a = 18
a = 18/9 = 2.
Then a=2.
Hope you understand.
