Question

Desfaceti parantezele.
a) (2a-√3)(a²+3a-√3); b) (a-b)(a²+ab+b²);
c) (b-2b²+1)(1-b); d) (x²+2xy+y²)(x-y)

va rog mult urgent!!!

Answer 1

$a) (2a-\sqrt{3})(a^{2} +3a-\sqrt{3}) = 2a^{3} +6a^2-2a\sqrt{3}-a^2\sqrt{3}-3a\sqrt{3}+3$

$b) (a-b)(a^2+ab+b^2) = a^3+a^2b+ab^2-a^2b-ab^2-b^3 = a^3-b^3$

$c) (b-2b^2+1)(1-b) = b-b^2-2b^2+2b^3+1-b = 2b^3-3b^2$

$d) (x^2+2xy+y^2)(x-y) = x^3-x^2y+2x^2y-2xy^2+xy^2-y^3 = x^3+x^2y-xy^2-y^3$