A quadratic function f(x) attains its minimum value of -15 at x=3. If f(0)=5, find the value of f(9). Options:	A) 65	B) 55	C) -25	D) 75	E) 25
Explanation :   65ny quadratic equation can be written as f(x) = α(x-k)2 - β   Given that minimum value of f(x) is -15 at x=3   f(x) is minimum when x=k =&gt; k=3   -15=-β =&gt; β= 15   65lso given that f(0) = 5   =&gt; 5 = α(0-3)2 - 15 =&gt; α= 20/9   Hence, f(9)=20/9(9-3)2 - 15 = 65   65nswer : 65
<result>A</result>
A quadratic function f(x) attains its minimum value of -15 at x=3. If f(0)=5, find the value of f(9).