Question 6
SurdsIf (3 − 4√2)(1 + 3√2) = a + b√2, find the value of b.
- A.5
- B.−5
- C.−21
- D.21
Show the answer and explanation
Answer: A (5)
Explanation
Expanding: 3 + 9√2 − 4√2 − 24 = −21 + 5√2, so b = 5.
If (3 − 4√2)(1 + 3√2) = a + b√2, find the value of b.
Answer: A (5)
Expanding: 3 + 9√2 − 4√2 − 24 = −21 + 5√2, so b = 5.