Solve a surd ( 5-sqrt2)²?
2 Answers
Apr 12, 2018
Explanation:
note that √a×√a=a
(5−√2)2=(5−√2)(5−√2)
expand the factors using FOIL
⇒(5−√2)(5−√2)
=25−5√2−5√2+(√2×√2)
=25−10√2+2=27−10√2
Apr 13, 2018
Explanation:
Multiply each term:
Collecting like terms: