Question

4. If 5x – 2y = 7 and xy = 2, find the value of (5x + 2y)?​

Answer 1

Step-by-step explanation:

5x-2y=7

xy=2

(5x-2y)2=25x2+4y2-20xy

49=25x2+4y2-40

89=25x2+4y2

(5x+2y)2=25x2+4y2+20xy

(5x+2y)2=89+40

5x+2y)2 =129

5x+2y=

$\sqrt{129}$

answer = root 129

Answer 2

Answer:

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