Question

simplify (√5+4)(√5-2) A)-3+2√5 B)3+2√5 C)-2+3√5

Answer 1

Answer:

A

Step-by-step explanation:

$(x + y)(a - b) = xa - xb + ya - yb$

(√5+4)(√5-2) =

= $( {\sqrt{5})}^{2} - 2 \sqrt{5} + 4 \sqrt{5} - 8$

= $5+ 2 \sqrt{5} - 8$

= $- 3+ 2 \sqrt{5}$

Hope this helps ^-^