If 5x - 2y = 7 and xy = 2 , find the value of ( 5x + 2y )^ 2
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Answer:
25x² + 4y² - 20xy
Step-by-step explanation:
(a - b)² = a² - 2ab + b²
Here, a = 5x , b = 2y
(5x - 2y)² = (5x)² + (2y)² - (2 * 5x * 2y)
(5x - 2y)² = 25x² + 4y² - 20xy
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129 is your answer
Hope its help you.
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