Answer:
The expression for temperature is already in vertex form: T=a(d−d subscript 0)^2+T subscript 0. The vertex of this quadratic function occurs at (15,20).
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Answer:
(x-4)(x-12)
Explanation:
+
Break the expression into groups

Factor out x from x^2 - 4x : 
Factor out -12 from -12x + 48: 
= x(x-4)-12(x-4)
Factor out common term x-4
= (x-4)(x-12)