1, when 1-a=0, that is, a= 1 and f(x)=2, the identity on [-2,2] is satisfied.
2. when 1-a >; 0 is a
The axis of symmetry is x= 1/2, which intersects with the positive semi-axis of Y-axis.
△=(a- 1)^2-4( 1-a)(3-a)& lt; 0
Get an a
So, a< this time, a
3. When 1-a
To satisfy the meaning of the question, you must:
f(0)= 3-a & gt; 0
f(-2)>0
f(2)>0
Get an a
So at this time 1
To sum up, the range of A is a < 9/7.