Question

como resolvo essa conta ?
(y-3x³)²=
(a+b)(a-b)=

Answer 1

(x+y)² = x² + 2 xy+y²

$(y-3x^{3})^{2} = y^{2}-2y(3x^{3})+ (-3x^{3}) ^2 = y^{2}-6yx^{3}+ 9x^{6}$


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

Answer 2

(y- 3x³)² = y² - 2(y)(3x³) + (3x³)² = y² - 6x³y + 9x^6

(a +b)(a - b) = (a - b)²