Question

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Answer 1

Explicație pas cu pas:

${4}^{ - 3x - 9} \leqslant {2}^{x} \times 8 \\{ {(2}^{2}) }^{ - 3x - 9} \leqslant {2}^{x} \times {2}^{3} \\ {2}^{2( - 3x - 9)} \leqslant {2}^{x + 3} \\ - 6x - 18 \leqslant x + 3 \\ - 18 - 3 \leqslant x + 6x \\ - 21 \leqslant 7x = > - 3 \leqslant x$

=> x = -3