Question

if 7x-6y=30 and xy=5
find 49x²+36y²​

Answer 1

Answer:

1320

Step-by-step explanation:

$7x - 6y = 30 \\ {(7x - 6y)}^{2} = {30}^{2} \\ 49 {x}^{2} + 36 {y}^{2} - 84xy = 900 \\ 49 {x}^{2} + 36 {y}^{2} - 84 \times 5 = 900 \\ 49 {x}^{2} + 36 {y}^{2} - 420 = 900 \\ 49 {x}^{2} + 36 {y}^{2} = 900 + 420 \\ 49 {x}^{2} + 36 {y}^{2} = 1320$

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Answer 2

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