Question

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

Answer 1

Step-by-step explanation:

$xy = 2 \\ x = \frac{y}{2} \\ 5x - 2y = 7 \\ 5 \frac{y}{2} = - 2y = 7 \\ \frac{5y}{2} - 2y = 7 \\ \frac{5y - 4y}{2} = 7 \\ \frac{y}{2} = 7 \\ y = 7 \times 2 \\ y = 14$

xy = 2

x * 14 = 2

x = 2/14

x = 1/7

(5x+2y)² = (5*1/7 + 2*14)²

= (5/7 + 28 )²

= ( 5 + 28*7 )²

7

= ( 5 + 196 )²

7

= ( 201 )²

7

= (40401)

49