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1.Relation and Function
medium
$b$ व $c$ के वे मान जो कि सर्वसमिका $f(x + 1) - f(x) = 8x + 3$ को संतुष्ट करते है , जहा $f(x) = b{x^2} + cx + d$, है
A
$b = 2,\;c = 1$
B
$b = 4,\;c = - 1$
C
$b = - 1,\;c = 4$
D
$b = - 1,\;c = 1$
Solution
(b) $f(x + 1) – f(x) = 8x + 3$
$ \Rightarrow \,\,[b\,{(x + 1)^2} + c\,(x + 1) + d] – (b{x^2} + cx + d) = 8x + 3$
$ \Rightarrow \,\,(2b)\,x + (b + c) = 8x + 3$
$ \Rightarrow \,\,2b = 8,\,\,b + c = 3\,\,\, \Rightarrow \,\,b = 4,\,\,c = – 1.$
Standard 12
Mathematics