Question

Simplify ($\sqrt{15}$+$\sqrt{13}$) ($\sqrt{15}$-$\sqrt{13}$)

[2 Marks]

Answer 1

Using property,
($\sqrt{a}$+$\sqrt{b}$) ($\sqrt{a}$-$\sqrt{b}$) = a - b

[1 Mark]

Therefore,
($\sqrt{15}$+$\sqrt{13}$) ($\sqrt{15}$-$\sqrt{13})=15-13=2$

[1 Mark]