1) (x + √13)(x - √13) = x^2 - 12) (x - √7)(x + √7) = x^2 - 3) (x - (3 - √5))(x - (3 + √5)) = x^2 - 6x + 4
1) (x + √13)(x - √13) = x^2 - 1
2) (x - √7)(x + √7) = x^2 -
3) (x - (3 - √5))(x - (3 + √5)) = x^2 - 6x + 4