Question

If 7x-3y = 7 and xy = 2 find the value of
(7x+ 3y)?​

Answer 1

Answer:

- 7

Step-by-step explanation:

7x - 3y = 7

-(7x+3y) = 7

7x + 3y = -7

Answer 2

Answer:

_____________________________

(7x - 3y) = 7

xy = 2

⠀

(7x - 3y)² = 49x² + 9y² - 42xy

(7)² = 49x² + 9y² - 42×2

49 = 49x² + 9y² - 84

49 + 84 = 49x² + 9y²

133 = 49x² + 9y²

⠀

(7x + 3y)² = 49x² + 9y² + 42xy

(7x + 3y)² = 133 + 42×2

(7x + 3y)² = 133 + 84

(7x + 3y)² = 217

(7x + 3y) = √217

_____________________________

Step-by-step explanation:

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