[" 22.Check the surjectivity of the function "f:z rarr z" defined by "f(x)=x^(2)" ."],[" 23.Find the intervals in which "f(x)=10-6x-2x^(2)" is strictly decreasing? "],[" an Find proiction of the vertor "1+2i-7" & on the yector "1-1-4 xi]