If x=2-root 5/2+root5 and y = 2+root 5 / 2-root 5 find x square - y square

Step-by-step explanation:

x=2-√5/2+√5

y=2+√5/2-√5

x²-y²=(x-y)(x+y)

so

x+y=4

and x-y=2√5-√5

=√5

so x²-y²=4×√5

=4√5

thank you

4√5 is the correct answer.

(3X +2ky)2

(3X)2 +(2.3X.2KY)+ (2KY)2

9X + 12XKY+4KY

Step-by-step explanation:

187/9

Step-by-step explanation:

rationalise the both x and y

2 and 3 have unique solution

a1/a2=b1/b2 does not equalc1/c2

1/3=-3/-9does not equal-3/-2

1/3=1/3does not equal-3/-2

it has no solutio

2)a1/a2does not equalb1/b2

2/3does not equal1/2

it has unique

2x+y-5=0

3x+2y-8=0

6x+3y-15=0(multiplying by3 in both side)

6x+4y-16=0( multiplying by 2in both side)

- - +

-y=1

y=-1

puting the value y in equation

2x+(-1)=5

2x-1=5

2x=5+1

2x=6

x=6/2

x=3

y=-1

3) a1/a2=b1/b2=c1/c2

3/6=-5/-10=-20/-40

1/2=1/2=1/2

it has infinitely many solution

4)a1/a2does not equalb1/b2

1/3does not equal-3/-3

it has unique solution

x-3y-7=0

3x-3y-15=0

3x-9y-21=0(multiplying by3 in both side)

3x-3y-15=0

- + +

-6y=-6

y=-6/-6

y=1

puting the value of y in equation 1

x-3*1-7=0

x-3-7=0

x-10=0

x=10

y=1

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Step-by-step explanation:

Step-by-step explanation:

answer right or wrong write on comment box

x + 2y -5z + 9 = 0 is a wrong equation here so I took -5z as -5 only