Question

Fie functia f(X)=2x-3 determinati valorile reale a le lui x pentru care 2f(x)<6x-f(-1)

Answer 1

2f(x)= 2(2x-3) = 4x-6
f(-1)= 2 * (-1) - 3= -2 -3= -5

=> 4x-6< 6x-(-5)
= 4x-6<6x + 5 | +6
= 4x < 6x +11 | -4x
= 0 < 2x + 11 | -11
= -11 < 2x | :2
= -11/2 < x
=> x € { - infinit ; -11/2}