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a² + ab +ab + b²
a²+2ab +b²
b) (a-b) (a-b)
a²-ab -ab+ b²
a² -2ab +b²
c) (a+b) (a-b)
a² -ab +ab- b²
a² -b²
d) (2a+6) (2a-9)
4a² - 18a +12a -54
4a²-6a -54
b)(a-b)^2=a^2-2ab+b^2
b)(a+b)(a-b)=a^2-b^2
d)(2a+6)(2a-9)=4a^2-18a+12a-57=4a^2-6a-54