Question

(3x + 5y) = 15 and xy = 4, find the value of 9x^2+ 25y^2​

Answer 1

Answer:

105

Step-by-step explanation:

Given,

3x+5y = 15

(Squaring Both sides)

(3x+5y)^2=(15)^2

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

=> 9x^2 + 25y^2 + 30xy = 225

We know,

xy = 4 (Given)

=> 9x^2 + 25y^2 + 30(4) = 225

=> 9x^2 + 25y^2 + 120 = 225

=> 9x^2 + 25y^2 = 225 - 120

=> 9x^2 + 25y^2 = 105

Answer 2

Answer:

105 is ur answer bro

Step-by-step explanation:

hope it helps