Question

Help me on letter b please

Answer 1

Use the commutative property to reorder the terms.
Then, simplify the product.
Finally, subtract the numbers.
Your final answer is 3.

Answer 2

Answer:

Answer: 2

Step-by-step explanation:

$(a-b)(a+b)=a^{2}- b^{2}$

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