Question

Exercițiu 2/5/6
Multumesc

Answer 1

2. (g ο f)(x) = g(f(x)) = f(x) - 2017 = x + 2017 - 2017 = x
=> (g ο f)(0) = 0

5. Doua drepte sunt perpendiculare daca produsul pantelor este -1.
y=x-10 => m=1  ( m=panta, deoarece y=mx+n ) 
$m_{A} * m_{d} =-1 =\ \textgreater \ m_{A} * 1=-1 =\ \textgreater \ m_{A} = -1$
ecuatia dreptei A = y-$y_{A}$ = m(x-$x_{A}$ ) 
=> y-1=-1(x-0) => y=-x+1 

6. $A= \frac{AB*AC*sinA}{2} = \frac{6*4* \frac{1}{2} }{2} = \frac{12}{2} = 6$