Question

a⁴-a⁴ = (a²+a²) (a²-a²)

Answer 1

it should be a^4 not A^4

then,

by formula a^2 - b^2 = (a+b)(a-b)

Here,

a^4 -a^4 
  
but as both are same it will equal to 0 

EXPAND :-

a^4  - a^4 = (a^2 +a^2)(a^2-a^2)

a^4 - a^4 = (a^2 + a^2)(a+a)(a-a)



there is no need of this solution, because it equal to 0 because a^4 - a^4 will be equal then it will be 0

 i hope this will help you

-by ABHAY

Answer 2

yes its right
${a}^{4} + {b }^{4} = {(a}^{2} + {b}^{2} )( {a}^{2} - {b}^{2}) \\ {a}^{4} + {b}^{4} = ( {a}^{2} ) ^{2} + ({b}^{2} ) {}^{2}$
hope this will help u