Question

Find the number of integral values.​

Answer 1

x^4 - x^2 <= 2

x^4 - x^2 - 2 <= 0

(x^2 + 2)(x^2 - 1) <= 0

so, x^2+2 has not any integer value....

so, x^2 = 1

x = -1, 1

so, the range of this inequality is [-1,1]

so, in this range, 3 integer value, -1,0,1