Question

Simplify: (4 - √2 )(5 + √2 )

Answer 1

Answer:

4*5=4+5

Step-by-step explanation:

Answer 2

Answer:

$(4 - \sqrt{2} )(5 + \sqrt{2} ) \\ \\ = 4(5 + \sqrt{2} ) - \sqrt{2} (5 + \sqrt{2} ) \\ \\ = 20 + 4 \sqrt{2} - 5 \sqrt{2} - 2 \\ \\ = 20 - 2 + 4 \sqrt{2} - 5 \sqrt{2} \\ \\ = 18 - \sqrt{2}$