Explicație pas cu pas:
a)
[tex]f(x)=1-2x[/tex]
[tex]f(-1)=1-2×(-1)=1+2 = 3[/tex]
[tex]f(1)=1-2×1=1-2=-1[/tex]
[tex]f(-1)-f(1)=3-(-1)=3+1=4[/tex]
b)
[tex]f(1)=-1 = > A(1;-1)[/tex]
[tex]y = 7 = > 1 - 2x = 7 \\ 2x = - 6 = > x = - 3 \\ = > B(-3; 7)[/tex]
[tex]\frac{1 + ( - 3)}{2} = \frac{1 + ( - 3)}{2} = \frac{ - 2}{2} = - 1 \\ \frac{( - 1) + 7}{2} ) = \frac{( - 1) + 7}{2} = \frac{6}{2} = 3\\ = > M( - 1 ; 3 )[/tex]
