Question:

Let \(f(x) = ax^2 + bx + c\) be such that f(1) = 3, f(-2) = λ and f(3) = 4. If f(0) + f(1) + f(-2) + f(3) = 14, then λ is equal to

Updated On: Mar 2, 2024
  • -4
  • \(\frac{13}{2}\)
  • \(\frac{23}{2}\)
  • 4
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The Correct Option is D

Solution and Explanation

Given,\( f(x) = ax^2 + bx + c \)
f(0) = c 
f(1)=a+b+c=3....(1) 
f(-2)=4a-2b+c=λ....(2) 
f(3)=9a+3b+c=4....(3) 
By solving (2) & (3) 
\(a+b= \frac{4-λ}{5}\)
Also, \(c = 3+λ+4=14\)
\(c=7-λ\)
Putting in (1) 
\(\frac{4-λ}{5} +7-λ=3\)
\(6λ = 24\)
\(λ=4\)
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Concepts Used:

Types of Relation

TYPES OF RELATION

Empty Relation

Relation is said to be empty relation if no element of set X is related or mapped to any element of X i.e, R = Φ.

Universal Relation

A relation R in a set, say A is a universal relation if each element of A is related to every element of A.

R = A × A.

Identity Relation

Every element of set A is related to itself only then the relation is identity relation.

Inverse Relation

Let R be a relation from set A to set B i.e., R ∈ A × B. The relation R-1 is said to be an Inverse relation if R-1 from set B to A is denoted by R-1

Reflexive Relation

If every element of set A maps to itself, the relation is Reflexive Relation. For every a ∈ A, (a, a) ∈ R.

Symmetric Relation

A relation R is said to be symmetric if (a, b) ∈ R then (b, a) ∈ R, for all a & b ∈ A.

Transitive Relation

A relation is said to be transitive if, (a, b) ∈ R, (b, c) ∈ R, then (a, c) ∈ R, for all a, b, c ∈ A

Equivalence Relation

A relation is said to be equivalence if and only if it is Reflexive, Symmetric, and Transitive.