The function f(x)=−x^2+4x+5 can be written in the form (x+ℎ)^2+k i. Write down the value of ℎ.
ii. Write down the value of k.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b