Question

X-y=2 x²+y²=34 find xy by expansion

Answer 1

Answer:

$we \: know \\ {x}^{2} + {y}^{2} = \: {(x - y)}^{2} + 2xy \\ or \: 34 = ( {2})^{2} + 2xy \\ or \: 2xy = 34 - 4 \\ or \: xy = \frac{30}{2} \\ or \: xy = 15$

Answer 2

Step-by-step explanation:

x-y=2

squatting on both sides

(x-y)^2=4

x2+y2-2xy=4

34-2xy=4

-2xy=4-34

-xy=-30/2

xy=15