How do you do this? Can someone explain this?

step-by-step explanation:

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225