Question

(a+b)^2-(a-b)^2. Представьте в виде произведения

Answer 1

2b×2a=4ab
............

Answer 2

$(a+b)^{2} - (a-b)^{2} = a^{2} +2ab+ b^{2} -( a^{2} -2ab+ b^{2} )$$= a^{2} +2ab+ b^{2} -a^{2} +2ab- b^{2} = 2ab+2ab=4ab$