Question

if x+y = 9 and x-y = 3 , then the value of 2 x square + 2y square is​

Answer 1

Answer:

ans is 78

Step-by-step explanation:

hope this will help you

Answer 2

Given:

x + y = 9 ------- (1)

x - y = 3. -------(2)

To find :

$2 {x}^{2} + 2 {y}^{2}$

Solution :

Adding Equation 1 and 2

$x + x + y - y = 9 + 3$

$\implies \: 2x = 12$

$\therefore \boxed{x = </strong><strong>6</strong><strong>}$

Substitute value of x in equation 1,

$x + y = 9$

$</strong><strong>6</strong><strong> + y = 9$

$\therefore{ \boxed{y = </strong><strong>3</strong><strong>}}$

Now,

$2 {x}^{2} + 2 {y}^{2}$

$= 2 \times {(</strong><strong>6</strong><strong>)}^{2} + 2 \times { (</strong><strong>3</strong><strong>)}^{2}$

$\therefore final \: answer \: is \boxed{ \huge{</strong><strong>9</strong><strong>0</strong><strong>}}$