Consider function g.
what's are the values of the function when x =-2 and when x=4​

Assuming you don't know much maths, so no quadratic identities, no first and second derivatives, no completing the square:

Note if you graph  y=x  and y=4−x , that the lines intersect (cross) at  x=2 .

Also note that if you move right or left on the  x  axis, whatever you add to  x , you subtract from  4−x .

So for example, if  x=2.1=2+0.1  then  4−x=4−2.1=1.9=2−0.1  

Therefore we can rewrite  x(x−4)  as  (2+a)(2−a)=4−a2  taking  a  as how far we are from  x=2 . In the above example,  a=0.1 .

Since a positive times a positive is a positive, and a negative times a negative is a po… (more)

Step-by-step explanation:

i belive those are the ones that are under 90 degreese.