Answer:
a=0 b= -3
Explanation:
step 1 , we know that there is only 1 coordinate given which is (8,-3) so we can say that 8 is x and -3 is y
step 2 , given that y=(x+a)^2 +b , we can substuite the x value ,which is 8 and the a value wich is -8 (because this is the turning point formula shape and in turning point we change the sign of the number inside bracket and keep the number outside the bracket with it's original sign)
step 3 , we write the value of a and b , since x =8(given in coordinate) and a equal to -8(turning point concept ) , so a value is 8-8 wich is equal to 0
and b is -3 just like given ,no change done to it .
hope this helps