Question

x+3y=5 , xy=3, x^2+9y^2​

Answer 1

Answer:

x^2 + 9y^2 = 7

Step-by-step explanation:

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As we know the identity of

(a + b)^2 = a^2 + b^2 + 2ab

(x + 3y)^2 = (x)^2 + (3y)^2 + 6xy

5^2 = x^2 + 9y^2 + 6 × 3

25 - 18 = x^2 + 9y^2

x^2 + 9y^2 = 7

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Answer 2

Answer:

7

Step-by-step explanation:

x+3y=5

Then, (x+3y)^2=25

x^2+9y^2+2x ×3y=25

x^2+9y^2+6 ×3=25

x^2+9y^2=7