Question

If 2x+6y=60 and xy=1 find x2 + 9y2

Answer 1

Hey mate ,

Hey mate ,Your answer is 894 .

Answer 2

Answer:

Given:

xy=1

Step by step explanation:

2x+6y=60

x+3y=30 (dividing both sides by 2)

(x+3y)²=302 (squaring both sides)

x²+9y²+6yx=900 [ (a+b)²=a²+b²+2ab) constitute that here ]

x²+9y²=900-6×1 (x×y=1)

x²+9y²=894