Question

Solve the inequality. (Enter your answer using interval notation.)
x^2 ≤ 81

Answer 1

x = (-9,9)

Explanation:

|x |< 9 - seperate the inequality into 2 possible cases

1. x<9, x>0 -x<9, x<0

find the intersection

x = (0,9) -x<9, x<0

find the intersection again

x = (0,9) x = (-9,0)

find the union

x = (-9,9)

Answer 2

the answer is -9≤x≤9