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A). Luas = s²
=(4x-3)²
=(4x-3)(4x-3)
=16x²-12x-12x+9
=(16x²-24x+9) cm²
Keliling = 4. s = 4(4x-3) = (16x-12) cm
B). Luas =16x²-24x+9 =16.4² - 24.4+9=256-96+9=169 cm²
Keliling =16x-12 = 14.4 - 12 = 64 - 12 =52 cm