Question

please give me answer

Answer 1

${ - 1}^{128} = 1 \\ { - 1}^{421} = - 1$
1 + (-1)
=0

Answer 2

since the first even is in positive
$( - 1) {}^{128}$
=
$- 1 \times - 1 \times - 1........$
but we know
$1 \times 1 = 1$
and power is even so the value of first number is 1
now second no.
$( - 1) {}^{421}$
now power is odd so outcome would be -1
so we have
$1 + ( - 1) = 1 - 1 = 0$
0 is the answer
Hope it helps