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If (4x - 7y) = 11 and xy = 8. what is the value of 16x2 + 49y2, given that x and y are positive numbers? |
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569 |
If (4x - 7y) = 11 xy = 8 Then = 16x2 + 49y2 ( a - b )2 = a2 + b2 - 2ab ( 11 )2 = 16x2 + 49y2 - 2 × 28 × 8 569 = 16x2 + 49y2 |
