Question

f : R - R , f(x)=ax+2 . Determinati a E R , stiind ca punctul A( radical din 3 ; -13 ) apartine reprezentarii grafice a functiei f .

Answer 1

$A( \sqrt{3} ;-13) E Gf => f( \sqrt{3} )=-13$
$f( \sqrt{3} )=a \sqrt{3} +2 => a \sqrt{3} +2=-13$
$a \sqrt{3} =-13-2 => a \sqrt{3} =-15 => a= \frac{-15}{ \sqrt{3} } =>a=-5 \sqrt{3}$