Expanding surds Watch

*Princess*
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#1
Report Thread starter 13 years ago
#1
How would u expand:

(3+√2) (5-2√2)

Would it be?

15 - 6√2 + 5√2 - 2 x 2=
13-2√2
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Malik
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#2
Report 13 years ago
#2
(Original post by *Princess*)
How would u expand:

(3+√2) (5-2√2)

Would it be?

15 - 6√2 + 5√2 - (2 x 2)=
13-2√2
15 - 6√2 + 5√2 - (2 x 2)
=11-√2

you expanded it right, but didnt collect the terms properly you have 15-4=11
and -6√2+5√2 which is -√2
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Niaya
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#3
Report 13 years ago
#3
um i think it would be

15-6√2 + 5√2 -4 = 11- √2 but im probably wrong

--------------

oo i actually got it right
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