x^2-81>= 0

Solution

x^{2} - 81 \geq 0

x \leq - 9 or x \geq 9

Interval Notation

(- \infty, - 9] \cup [9, \infty)

Solution steps

x^{2} - 81 \geq 0

Move

81

to the right side

x^{2} \geq 81

For

u^{n} \geq a

, if

n

is even then

x \leq - 81 or x \geq 81

81 = 9

x \leq - 9 or x \geq 9

\frac{x ^{10}}{x ^{5}}

x^{3} + 8 x^{2} - 64 x \leq 512

- 16 x^{2} y^{2} (x y^{5})

(\frac{4 x ^{3} z}{5 y ^{5}})^{2}

∣ 5 x + 2 ∣ - 2 < 3