Question

7. Simplify the following
(2x + 5y )^2 + (2x - 5y)^2​

Answer 1

Answer:

8x^2 + 50 y^2

Step-by-step explanation:

=(4x^2 + 20xy + 25y^2) + (4x^2 -20xy +25y^2).

= 8x^2 + 50 y^2

Answer 2

Answer:

8x^2 + 50y^2

Step-by-step explanation:

we know that,

{a+b}^2 = {a-b}^2+4ab

so,we can write the given equation in this form:

{(2x-5y)^2+ 40xy } + ( 2x -5y)^2

2{ 4x^2 +25y^2-20xy}+40xy

8x^2+50y^2-40xy +40xy

8x^2 +50y^2