Question

if 5x-2y=7,xy=3 then find value of 5x+2y​

Answer 1

Answer:

Step-by-step explanation:

5x - 2y = 7

x = 7+2y/5

(7+2y)y/5

2y^2 + 7y - 15 = 0

use quadratic formula

y = 3/2 , -5

therefore x = 2, -3/5

5x + 2y = 13, -7

Answer 2

Answer:

(5x-2y)=7

or, (5x-2y)²=49

or, (5x)²+(2y)²-2×5x×2y=49

or, 25x²+4y²-20xy=49

or, 25x²+4y²-60=49

or, 25x²+4y²=99

or, 25x²+4y²+2×5x×2y=99+2×5x×2y

or, 25x²+4y²+20xy=99+20xy

or, (5x+2y)²=99+60

or, (5x+2y)²=159

or, 5x+2y = √159 (Answer)

Step-by-step explanation:

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