It should be the 3rd one
A function can only have ONE answer
E.g. y = a (correct)
y = +/-a (incorrect)
Check the picture below.
bear in mind that a reference angle, is just the angle the "terminal point" makes with the x-axis, in this case, the green one.
Answer:
9
Step-by-step explanation:
The answer to your math problem is 4x=x^2-12