Math, asked by poojamahajan437, 11 months ago

If 5x-2y = 7 and xy=2, find the value of 25 x ² - 4y²

Answers

Answered by nhorsanglama

4

Answer:

hope it will help

Step-by-step explanation:

5x - 2y = 7

Squaring on both sides

(5x)²-(2y)² = 7²

(5x)²-2.5x.2y+(2y)² = 49

25x²-20xy+4y²= 49

25x²-20×2+4y² = 49

25x²-40+4y² = 49

25x² + 4y² = 49+40

25x² + 4y² = 89

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