(2+√8)(7-√2) = 2*7 + 7√8 - 2√2 -√8*√2
= 14 + 7*2√2 - 2√2 - √16
= 14 +12√2 - 4
= 10 + 12 √2
Now you do the other one, like this one but two steps
Can someone solve the questions below?I have no idea how to do them.
Only two questions btw...
1.A rectangle has a sides of length (2 + √8)cm and (7 - √2)cm.
Find the area of the rectangle.
Express your answer in the form a + b √2 ,where a and b are integers.
2.A cuboid has a square base.
The sides of the square are of length (1 + √2)cm.
The height of the cuboid is (5 - √2)cm.
Find the volume of the cuboid.
Express your answer in the form a + b √2 ,where a and b are integers.
1 answer
1 answer