If 4x - 7y = 3 and xy = 5, find the value of 16x² + 49y²
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Answer:
289
Step-by-step explanation:
16x² + 49y²
= (4x)² + (7y)²
= (4x + 7y)² + 2×4x×7y
= (3)² + 56×5
= 9+280
= 289
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