Question

Please answer this. Very urgent. I will mark you as Brainliest.

Answer 1

Answer:

1.2x+3y=8 and xy=2,

formula,

(a+b)

2

=a

2

+b

2

+2ab

∴(2x+3y)

2

=4x

2

+9y

2

+2(2x)(3y)

(2x+3y)

2

=4x

2

+9y

2

+12xy

8

2

=4x

2

+9y

2

+12(2)

∴4x

2

+9y

2

=64−24=40

2.(a + b)2 = a2 + 2ab + b2

(a - b)2 = a2 - 2ab + b2

[√(3x) - √(5y)]2 = [√(3x)]2 - 2√(3x) √(5y) + [√(5y)]2 = 3x - 2√(15xy) + 5y