Question

if 2x plus 3y = 5 and xy = 1 . find 4xsquare plus 9ysquare

Answer 1

Answer:

23

Step-by-step explanation:

2x+3y=5

xy=1

4x²+9y²=?

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Answer 2

Answer:

GIVEN: 2x+3y=5---------1 , xy=1------------2

TO FIND: 4x²+9y²

2x+3y=5

squaring both sides

(2x+3y)² =5²

4x²+9y²+2(2x)(3y)= 25

4x²+9y²+12xy= 25

4x²+9y²+12(1) =25 (from eq 2)

4x²+9y²+12=25

4x²+9y²=25-12

4x²+9y²=13

here is your answer 4x²+9y²=13