NABTEB Mathematics 2022 Objective — Question 13
Question 13 of 50 from the National Business and Technical Examinations Board (NABTEB) Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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If 5x+3y=4 and 5x-3y=2, what is the value of (25x^2-9y^2)?
- A. 20
- B. 16
- C. 2
- D. 8Correct
Explanation
Note 25x^2-9y^2 = (5x+3y)(5x-3y) = 4 x 2 = 8.
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