1.Relation and Function
medium

જો $f(x) = b{x^2} + cx + d$ અને $f(x + 1) - f(x) = 8x + 3$ હોય તો  $b$ અને $c$ ની કિમત મેળવો.

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

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