1:14. If 5x – 2y = 7 and xy = 2, find the value of (5x + 2y)2. – InterviewSolution

1.

1:14. If 5x – 2y = 7 and xy = 2, find the value of (5x + 2y)2.

Answer»

Answer:

129

Step-by-step explanation:

5x - 2Y = 7

xy = 2

(5x-2y)² = 25x²+4y²-20XY

49 = 25x²+4y²-40

25x²+4y² = 89

(5x+2y)² = 25x² + 4y² + 20xy = 89+40 = 129

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