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b) (2y-√3)(y+1) = 2y² + 2y -√3 y - √3 = 2y² +(2 - √3)y - √3
c) (a+√2)(a-√3) = a² - √3 a + √2 a - √6 = a² + (√2 - √3)a - √6
d) (2√2+k)(√2-k) = 4 - 2√2 k + √2 k - k² = 4 - √2 k - k²