Question

49/25 x^2 +64_49 y^2​

Answer 1

Your question should be $\frac{49}{25} x^2-\frac{64}{49} y^2$

This question requires factorization.

→ $(\frac{7}{5} x)^2-(\frac{8}{7} y)^2$

The suitable identity is difference of square formula.

→ $(A+B)(A-B)=A^2-B^2$

By comparing with formula

→ A : $\frac{7}{5} x$

→And B : $\frac{8}{7} y$

→ $A^2-B^2$

→ $(\frac{7}{5} x+\frac{8}{7} y)(\frac{7}{5} x-\frac{8}{7} y)$