Which one of the following is equivalent to (√5 – 2)²?
Answer:
4) F
(√5 – 2)²
Using the (a – b)² = (a² + b² – 2ab) rule,
(√5)² + (2)² – (2 x √5 x 2)
5 + 4 – 4√5 = 9 – 4√5
BMAT 2017 Section 2 Question 4
Which one of the following is equivalent to (√5 – 2)²?
4) F
(√5 – 2)²
Using the (a – b)² = (a² + b² – 2ab) rule,
(√5)² + (2)² – (2 x √5 x 2)
5 + 4 – 4√5 = 9 – 4√5