Answer:
a = 3
Explanation:
since the parabola passes through (7, 27 ) then te coordinates of the point make the equation true.
substitute x = 7 and y = 27 into the equation and solve for a
27 = a(7 + 2)(7 - 6) = a(9)(1) = 9a ( divide both sides by 9 )
3 = a