Question

Escreva o polinomio que representa cada produto c)(2a+b).(a-2b) d) (2x+1).(-6x2-5x+3)

Answer 1

c)(2a+b).(a-2b)
2a²-4ab+ab+2b²
2a²-3ab+2b²
d) (2x+1).(-6x+2-5x+3)
12x²+4x-10x²+6x-6x+2-5x+3
2x²-x+3

Answer 2

$(2a+b).(a-2b)\\\\ 2a*a -2a*2b+a*b-2b*b\\\\ 2a^2-4ab+ab-2b^2\\\\ 2a^2-2b^2-3ab$


$(2x+1).(-6x^2-5x+3)\\\\ 2x*-6x^2 +2x*-5x +2x*3 +1*-6x^2+1*-5x+1*3\\\\ 12x^3 -10x^2+6x-6x^2-5x+3\\\\ 12x^3-16x^2+x +3$