1) (a-4b)^2-8ab-17b
2) -9c^2+(3c+b)^2-b^2
3) (5a-6)^2-(5a-6)(5a+6)
4) (7b-t)(t+7b)+(7b+t)^2
5) (9-8b)(2b+3)+(4b-1)^2
6) (11c+3)^2-2c(5,5c+33)
2) -9c^2+(3c+b)^2-b^2
3) (5a-6)^2-(5a-6)(5a+6)
4) (7b-t)(t+7b)+(7b+t)^2
5) (9-8b)(2b+3)+(4b-1)^2
6) (11c+3)^2-2c(5,5c+33)
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Answers & Comments
2)-9c²+(3c+b)²-b²=-9c²+(9c²+2•3c•b+b²)-b²=-9c²+9c²+6bc+b²-b²=6bc
3) (5a-6)²-(5a-6)(5a+6)=(5a-6)²-(5a-6)²=0