tina-wood_60a42cc611721
tina-wood_60a42cc611721
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c) (A+B)(A-B) = A^2 - AB + BA - B^2 = A^2 - BA+BA - B^2 = A^2 + 0 + B^2 = A^2 - B^2. Porque aparece un cambio de signo al very final? no entiendo l. a. igualdad A^2 - BA+BA - B^2 = A^2 + 0 + B^2