Surds & Square Roots , √8 + √18 = ? ,,,,,,,,,,,
Q. √8 + √18 = ?
Options: a) √26 b) √10 c) √50 d) √25
Soln:
√8 = √4 × 2 = 2√2
√18 = √9 x 2 = 3√2
Adding like terms: 2√2 + 3√2 = 5√2
Ans: b) 50 = √25 x 2 = 5√2
Q. √9√6 + √100 = ? Options: a) √13 b) 6 c) √115 d) 12
Soln
Square root: √100 = 10, So the expression becomes: √9√10 + 6
Add inside the inner radical 10+6 =16, Expression: √9√16 = √9*4 = √36 = 6
Ans: b) 6