Question

1) |x|≤ 3,2
2)|×|<1,9
3)|×|≤5,78
4)|×|<0,89​

Answer 1

|f(x)| <= A   (A > 0) ⇒ - A <= f(x) <= A

1) |x|≤ 3,2

-3.2 ≤ x ≤ 3.2

2)|×|<1,9

-1.9 < x < 1.9

3)|×|≤5,78

-5.78 ≤ x ≤ 5.78

4)|×|<0,89​

-0,89 < x < 0.89