. Star question:
If f(1)=4 and f(x+y)=f(x)+f(y)+7xy+4,then f(2)+f(5)=? Choose the correct choice from the following answers.
A) 125
B) 977
C) 289
D) 1077
E) 111
Let x =1 and y = 1   f(1 + 1) = f(1) + f(1) + 7 x 1 x 1 + 4 ⇒⇒ f(2) = 19   Let x =2 and y = 2   f(2 + 2) = 19 + 19 + 7 x 2 x 2 + 4 ⇒⇒ f(4) = 70   Let x = 1 and y = 4   f( 1 + 4) = 4 + 70 + 28 + 4= 
<gadget id="calculator">4 + 70 + 28 + 4</gadget>
<output>106</output>
106   f(2) + f(5)= 125   125nswer:125
<result>A</result>
. Star question:
If f(1)=4 and f(x+y)=f(x)+f(y)+7xy+4,then f(2)+f(5)=?