Question

a) \(\left(2-\sqrt{a}\right)\left(2+\sqrt{a}\right)\)

b) \(\left(3+\sqrt{a}\right)\left(3-\sqrt{a}\right)\)

Giúp mình nhé, mình đang cần gấp

Answer 1

\(a,\left(2-\sqrt{a}\right)\left(2+\sqrt{a}\right)=4-a\)

\(b,\left(3+\sqrt{a}\right)\left(3-\sqrt{a}\right)=9-a\)

Answer 2

a) \(\left(2-\sqrt{a}\right)\left(2+\sqrt{a}\right)=2^2-\left(\sqrt{a}\right)^2=4-a\)

b) \(\left(3+\sqrt{a}\right)\left(3-\sqrt{a}\right)=3^2-\left(\sqrt{a}\right)^2=9-a\)