No 11,12,13 jawaban sama caranya makasih :))

11. (4x-3)² = (4x-3)(4x-3) = (4x)² -3.4x -3.4x +(-3)² = 16x² -12x – 12x +9 = 16x²-24x+9 (D)
12. (3g-5h)² = (3g-5h)(3g-5h) = (3g)² -3g.5h -5h.3g + (-5h)² = 9g² -15gh – 15gh + 25h² = 9g² – 30gh + 25h² (D)
13. (-3x-4y)² = (-3x-4y)(-3x-4y) = (-3x)² -3x(-4y) -4y(-3x) + (-4y)² = 9x² + 12xy + 12xy +16y² = 9x² + 24xy + 16y² (D).