Question

(-3+square root5)(-3-squar root-5)

Answer 1

$(-3+ \sqrt{5}) (-3- \sqrt{5}) \\ \\ =(-3)^2 - ( \sqrt{5} )^2 \\ \\ =9 - 5\\ \\ = \boxed4$

Answer 2

[-3 +√5] [-3-√5]
⇒[-3]²-[√5]²
⇒9-5
⇒4