y=ax²-2ax-3a(a

问题描述:

y=ax²-2ax-3a(a

①∵y=ax²-2ax-3a∴令y=0即ax²-2ax-3a=0即a(x-3)(x+1)=0∴x=3或x=-1,由已知:A(3,0) ,B(-1,0)②令y=ax²-2ax-3a中的“x”为0∴y=﹣3a即E(0,-3a)∵y=a(x-1)²-4a ∴C(1,-4a)又A(3,0)∴圆心M(2...