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JEE Mains · Maths · STD 12 - 1. relation and function

माना \(a, b, c \in R\) यदि \(f(x)=a x^{2}+b x+c\) ऐसा है कि \(a+b+c=3\) है तथा सभी \(x, y \in R\) के लिए
\(f(x+y)=f(x)+f(y)+x y\) है, तो \(\sum_{n=1}^{10} f(n)\) बराबर है:

  1. A \(255\)
  2. B \(330\)
  3. C \(165\)
  4. D \(190\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(330\)

Step-by-step Solution

Detailed explanation

\(f\left( x \right) = a{x^2} + bx + c\) \(f\left( 1 \right) = a + b + c = 3 \Rightarrow f\left( 1 \right) = 3\) Now \(f\left( {x + y} \right) = f\left( x \right) + f\left( y \right) + xy\,\,\,\,\,\,...\left( 1 \right)\) Put \(x=y=1\) in eqn \((1)\)…
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