Question

49-a²=
1-4y2=
25-99²=
49n²-100=
36-64x²=
81m²-121n²=​

Answer 1

49-$a^{2}$= -351

1-4y2=5

25-$99^{2}$= -9776

49$n^{2}$-100=2301n

36-64$x^{2}$= -4060

81$m^{2}$-121$n^{2}$= -8080mn