Simplify: (5x + 11y)² + (5x - 11y)²

Simplify: $$\frac{8.4 × 8.4 - 2.8 × 2.8}{5.6 × 11.2}$$​

The value of $$\frac{0.66^3 - 0.22^3}{0.66^2 + 0.1452 + 0.22^2}$$​is:

Simplify$$\frac{64x^2 - 49}{8x - 7} - 8x$$​

Simplify: $$(x + 7)^2$$​​

Simplify: (5x + 11y)² + (5x - 11y)²

14² + 16² + 24² + 2(14 × 16 + 16 × 24 + 24 × 14) = ?

Simplify:$$\frac{732 \times 732 \times 732 + 268 \times 268 \times 268}{73.2 \times 73.2 + 26.8 \times 26.8 - 73.2 \times 26.8}$$​

Simplify x(5x − 9) + 7(x² − 2) + 17

Simplify $$2\left(\left(\frac{6}{2}\right)x^2-22x+15\right)-6(x^2+5x-18)$$.

Simplify x(6x – 3) + 5(x² – 4) + 18.