NDA2025MathematicsTrigonometric Ratios & IdentitiesActual
Consider the following for the three (03) items that follow: Let p = 2 - and q = - 2 . What is (p + q) equal to?
Options
- A4
- B4
- C2 4
- D2 4
Correct answer
D. 2 4
Step-by-step solution
Given p = 2 - and q = - 2 . Simplifying p : p = 2 2 - = 2 - 2 2 = (2 - ) 2 = 2 Simplifying q : q = - 2 2 = 2 - 2 2 = (2 - ) 2 = 2 = 1 2 Now, adding p and q : p + q = 2 + 1 2 Using 2 = 2 : p + q = 2 + 1 2 p + q = 2 ^2 + 2 2 2 Using the identity 2 = 1 - 2 ^2 in the numerator and 2 = 2 in the denominator: p + q = 2 ^2 + (1 - 2 ^2 ) 2 2 p + q = 1 2 2 Multiplying and dividing by 2 : p + q = 2 2 2 2 = 2 4 p + q = 2 4 Answer: 2 4