Question

Упростите выражение $(b-sqrt{b^2-4ac})(b+sqrt{b^2-4ac})$

Answer 1

$(b-sqrt{b^2-4ac})(b+sqrt{b^2-4ac})=b^2-(sqrt{b^2-4ac})^2=b^2-b^2+4ac=4ac$

Answer 2

$(b-sqrt{b^{2}-4ac })(b+sqrt{b^{2}-4ac })=b^{2}-(sqrt{b^{2}-4ac })^{2}=b^{2}-b^{2}+4ac=4ac$