1) (a - k)(a + k) = a² - k²
2) (d - 4)(d + 4) = d² - 4² = d² - 16
3) (5 + y)(5 - y) = 5² - y² = 25 - y²
4) (10 + x)(x - 10) = x² - 10² = x² - 100
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1) (a - k)(a + k) = a² - k²
2) (d - 4)(d + 4) = d² - 4² = d² - 16
3) (5 + y)(5 - y) = 5² - y² = 25 - y²
4) (10 + x)(x - 10) = x² - 10² = x² - 100
2. d^2-16
3. 25-y^2
4. 10x-100+x^2-10x