a) (7√6)² = 49 × 6 = 294

b) (6√5)² = 36 × 5 = 180

c) (3√11)² = 9 × 11 = 99

d) (x - 8)² = (x - 8)(x - 8) = x(x - 8) - 8(x - 8) = x² - 8x -8x + 64 = x² - 16x + 64

e) (x + 9)² = (x + 9)(x + 9) = x(x +9) + 9(x + 9) = x² + 9x + 9x + 81 = x² + 18x +81

f) (2x + 3)² = (2x + 3)(2x + 3) = 2x(2x +3) + 3(2x +3) = 4x² + 6x + 6x + 9 = 4x² + 12x + 9

g) (3x)² = 9x²

h) (8x)² = 64x²

i) (5x)² = 25x²