Perform the following addition and/or subtraction

Question

Y to the 2nd power -4y+4y-16

Answer 1

y² - 4y + 4y -16 = y² - 16

 

That is all there is to it, assuming the problem is stated correctly.

Answer 2

y² - 4y + 4y - 16

 

= y² - 16

 

This could be factored to (y-4)(y+4)

but for simple addition and subtraction

the answer is y² - 16