A) Minimum at (5,3) because the 4 (a) and the b (in front of the x is 1) are positive, the relation will be positive. When looking at the h (-5) you must always consider it as if it was the opposite sign. So here it's negative so in reality it's positive.
The opposite of -25
to find the opposite of a number, just switch the sign
example : opposite of 3 is -3
opposite of -5 is 5
so the opposite of -25 is 25 <==
