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b. (x-4)(x+4) + (x+5)(x-5) = (x² - 16) + (x² - 25) = 2x² - 41
2. (4x+7)(2x-3) = 8x² - 12x + 14x - 21 = 8x² + 2x - 21
3. (3a-8)(3a+8) = (3a)² - (8)² --> 9a² - 64
4. (20a² - 5a) / 5a = 4a - 1
= (x² + 4x -12) - (2x² - x - 6)
= -x² + 3x - 18
2. (x-4)(x+4) + (x+5)(x-5)
= (x² -16) + (x²-25)
= 2x² -31
3. (4x + 7) (2x - 3)
= 6x² -12x + 14x -21
= 6x² + 2x - 21
4. (3a -8) (3a+8)
= 9a² - 24
5. 20 a² - 5a / 5a
= -20a²
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