Question

me ajudem a responder essas questão

Answer 1

Oi Milinha!

b-
( -b²+ab-4)+(2ab²-ab-5)
-ab²+ab-4 +2ab²-ab-5
-ab²+2ab²+ ab-ab -4-5
+1ab²-9

c)
( -x³-3x²+x)-3.(x³+2x²)
-x³-3x²+x-3x³-6x²
-x³-3x³-6x²-3x²+x
     -4x³-9x²+x

d)
(a³+2a²-5)-( a³-a²-5)
a³+2a²-5 -a³+a²+5
a³-a³+2a²+a²-5+5
3a²

Bons estudos!!!


 

Answer 2

Boa tarde!

Solução!


$B)~~~~~\\\\\\\ (-ab^{2} +ab-4)+(2ab^{2}-ab-5)\\\\\ (-ab^{2}+2ab^{2}+ab-ab-4-5)\\\\\\\ (ab^{2}+0-9)\\\\\\ \boxed{(ab^{2}-9)}$


$C~~~~\\\\\ (-x^{3}-3 x^{2} +x)-3( x^{3}+2 x^{2})\\\\\\ (-x^{3}-3 x^{2} +x)+( -3x^{3}-6 x^{2})\\\\\\ (-x^{3}- 3x^{3}-3 x^{2}-6 x^{2}+x)\\\\\\\\ \boxed{(-4 x^{3}-9 x^{2} +x)}$




$D~~~~\\\\\\ (a^{3}+2a^{2} -5)-(a^{3}-a^{2} -5)\\\\\\ (a^{3}+2a^{2} -5)+(-a^{3}+a^{2} +5)\\\\\\ ( a^{3} -a^{3} +2a^{2} +a^{2}+5-5)\\\\\\\\ (0+3a^{2}+0)\\\\\\ \boxed{( 3a^{2})}$

Boa tarde!
Bons estudos!