Solve a surd ( 5-sqrt2)²?
2 Answers
Apr 12, 2018
Explanation:
"note that "sqrtaxxsqrta=a
(5-sqrt2)^2=(5-sqrt2)(5-sqrt2)
"expand the factors using FOIL"
rArr(5-sqrt2)(5-sqrt2)
=25-5sqrt2-5sqrt2+(sqrt2xxsqrt2)
=25-10sqrt2+2=27-10sqrt2
Apr 13, 2018
Explanation:
Multiply each term:
Collecting like terms: