Multiple Choice Question (MCQ)
Suppose a quadratic function
y = (a\dfrac{b}{2} )x^2cxa\dfrac{b}{2}
is constructed using three sides a,b,c of \triangle ACB, such that when x =1, the minimum value of the function is \dfrac{8}{5}b , then \triangle ACB is a(n)

×
isosceles triangle

×
acute triangle

×
obtuse triangle

✓
right triangle