Question

1^2 -2^2+3^2-4^2 +...+9^2 =

Answer 1

it is your answer . plz give me a brainiest.

Answer 2

${1 }^{2} - {2}^{2} + {3}^{2} - {4}^{2} + {5}^{2} - {6}^{2} + {7}^{2} - {8}^{2} + {9}^{2} =$
=1-4+9-16+25-36+49-64+81
=165-110
=55
plz mark me brainliest