Which function in vertex form is equivalent to f(x)=4+x^2-2x

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

How to use order of operation in 20 divide by 4 multiply 5 = 1

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1