Multiple choice Expand and simplify (2 + √5)(3 - √5) 1 + √5 11 + √5 1 - √5 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Expanding (2 + sqrt(5))(3 - sqrt(5)) using FOIL: 2*3 - 2*sqrt(5) + 3*sqrt(5) - (sqrt(5))^2 = 6 + sqrt(5) - 5 = 1 + sqrt(5).