Упростите вырожение (х+3)(х-3)-(х-4)²

Question

Упростите вырожение (х+3)(х-3)-(х-4)²

Answer 1

(х+3)(х-3)-(х-4)²=x²-9-(x²-8x+16)=x²-9-x²+8x-16=-25+8x

Answer 2

(x+3)(x-3)-(x-4)²=х²-9-(х²-8х+16)=х²-9-х²+8х-16=-25+8х.