Question

(9x-7)²-10≤(9x+3)(9x-5)

Answer 1

${(9x - 7)}^{2} - 10 \leqslant (9x + 3)(9x - 5) \\ 81 {x}^{2} - 126x - 10 \leqslant 81 {x}^{2} - 45x + 27x - 15 \\ 81 {x}^{2} - 126x - 81 {x}^{2} + 45x - 27x \leqslant - 15 + 10 \\ - 108x \leqslant - 5 \\ x \geqslant \frac{ - 5}{ - 108} \\ x \geqslant 21.6$