A = (4x - 4)²
= [4(x - 1)]²
= 4²(x - 1)²
= 16(x² - 2x + 1)
= 16x² - 32x + 16
B = (7x + 6)(7x - 6)
a² - b² = (a + b)(a - b)
= (7x)² - 6²
B = 49x² - 36
C = (3x - 4)²
= (3x - 4)(3x - 4)
= 9x² - 12x - 12x + 16
= 9x² - 24x + 16
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Verified answer
A = (4x - 4)²
= [4(x - 1)]²
= 4²(x - 1)²
= 16(x² - 2x + 1)
= 16x² - 32x + 16
B = (7x + 6)(7x - 6)
a² - b² = (a + b)(a - b)
= (7x)² - 6²
B = 49x² - 36
C = (3x - 4)²
= (3x - 4)(3x - 4)
= 9x² - 12x - 12x + 16
= 9x² - 24x + 16