Решите неравенство: (x^2-16)(x^2-9x+20)>=0.

\[\left( x^{2} - 16 \right)\left( x^{2} - 9x + 20 \right) \geq 0\]

\[x^{2} - 9x + 20 =\]

\[= x^{2} - 4x - 5x + 20 =\]

\[= x(x - 4) - 5(x - 4) =\]

\[= (x - 4)(x - 5)\]

\[(x - 4)^{2}(x + 4)(x - 5) \geq 0\]