Question

(2/5)x + 3 = 5 , so ( x = ? )​

Answer 1

Answer:

3+

5

∴

a

1

=

3+

5

2

On rationaliging the denominator , we get ,

a

1

=

(3+

5

)(3−

5

)

2(3−

5

)

=

9−5

6−2

5

=

4

6−2

5

=

2

3−

5

Also,

(a+

a

1

)

2

=a

2

+

a

2

1

+2

Substituting the values of a



=

a

1

,

We get ,

`(

2

3+

5

+

2

3−

5

)

2

=(a

2

+

a

2

1

+2)

∴a

2

+

a

2

1

+2=(

2

3+

5

+3−

5

)

2

=(3)

2

=9

∴a

2

+

a

2

1

=9−2=7.

Answer 2

Step-by-step explanation:

$\frac{2}{5} x + 3 = 5$

$\frac{2x + 3 \times 5}{5} = 5$

$\frac{2x + 15}{5 } = 5$

$2x + 15 = 5 \times 5$

$2x = 25 - 15$

$2x = 10$

$x = 5$