ધારો કે $f(x)$ એ તમામ $x \in R$ માટે વિકલનીય વિધેય છે અને $f(x+y)=f(x)+f(y)-3xy$ છે. જો $\lim _{h \rightarrow 0} \frac{f(h)}{h}=7$ હોય,તો $f^{\prime}(x)=$

  • A
    $-3x+7$
  • B
    $3x-7$
  • C
    $3x+7$
  • D
    $-7-3x$

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