Question

(3-2√5)(3+2√5)=?
Помогите!!!

Answer 1

$(3 - 2 \sqrt{5} )(3 + 2 \sqrt{5} ) = {3}^{2} - {(2 \sqrt{5}) }^{2} = 9 - 20 = - 11$

Answer 2

(3-2√5)(3+2√5)=3²-(2✓5)²=9-4*5=-11