MCQ
જો $f(x)=ax+b,g(x)=cx+d$ , તો $f(g(x))=g(f(x))$ જો $f(d)=.............$
- A$f(a)=g(c)$
- B$f(b)=g(c)$
- ✓$f(d)=g(b)$
- D$f(c)=g(a)$
$f(x)=ax+b $ તથા $g(x)=cx+d$
$\therefore f(g(x))=ag(x)+b$
$=a(cx+d)+b$
$=acx+ad+b$
$g(f(x))=cf(x)+d$
$=c(ax+b)+d$
$=acx+bc+d$
$\therefore f(g(x))=g(f(x)) $ જો, $ad+b=bc+d$
$\therefore $ જો $f(d)=g(b)$
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