show the steps clearly

Find the critical numbers of the function. h(t) = 13/4 - al/4 Step 1 For h(t) at3/4_ 4:1/4 . we have hit)= 3v4 - 4 Step 2 Critical numbers occur where h'(:) = 0 and where h'(t) is undefined. 324/2 - 4 0 = h{?) = _-3/4(3(1/2 - 4) = When the numerator is D, which occurs at the following values. (Enter your answers as a comma separated list.) Step 3 371/2 - 4 4/ is undefined when the denominator is 0, which occurs where i is equal to the following values. (Enter your answers as a comma-separated list.) Step 4 Thus, the two critical numbers are as follows, (Enter our answers as a comma separated list.)