please solve this.... I will make Brainlist
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Please mark me in the brainlist ✌️✌️✌️✌️✌️✌️✌️
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Step-by-step explanation:
(3x - 7y)² = (10)² [∵3x - 7y = 10]
∴ (3x)² + (7y)² - 2(3x)(7y) = 100
∴ 9x² + 49y² - 42xy = 100
∴9x² + 49y² - 42 (1) = 100
∴9x² + 49y² = 100 + 42
= 142
ANS : 9x² + 49y² = 142
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