a. √250 - √200 b. √147 + 2√98 c. 2√242 + 3√121 d. 5/6 √18 - 2/5 √50 e. -3/4√98 5/8√98

a) = √(25×10) - √(100×2) = 5√10 - 10√2
b) = √147 + 2√98 = √(49×3) + 2√(49×2)
= 7√3 + 2(7)√2
= 7(√3+2√2)
c) 2√242 + 3√121 = 2√(121×2) + 3(11)
= 2(11)√2 + 33
= 22√2 + 33
d)5/6 √18 - 1/5 √50
= 5/6 √9×2 - 1/5 √25×2
= (5/6)(3)√2 - (1/5)(5)√2
= 5/2 √2 - √2
= (5/2 - 1)√2
= 3/2 √2

a. √250 - √200
= √2x5³ - √2³x5²
= 5√2x5 - 2x5√2
= 5√10 - 10√2

b. √147 + 2√98
= √3x7² + 2√2x7²
= 7√3 + 2x7√2
= 7√3 + 14√2

c. 2√242 + 3√121
= 2√2x11² + 3√11²
= 2x11√2 + 3x11
= 22√2 + 33

d. 5/6√18 - 2/5√50
= 5/6√2x3² - 2/5√2x5²
= 5/6 x 3√2 - 2/5 x 5√2
= 15/6√2 - 10/5√2
= 75/30√2 - 60/30√2
= 15/30√2
= 1/2√2