Question

A= x³-3x²+8x-7
B=2x²+10
C=4x³+x-14

a) A+B=
b) A-B=
c) 2A=3B+2C= *(2A= 2vezes o A)*
d)B.C=

Answer 1

A= x³-3x³+8x-7           B= 2x²+10    e   C= 4x³+x-14

A+B=  X³-3X³+8X-7+2X²+10=  X³-X²+8X+3

a-b= X³-3X²+8X-7 -(2X²+10)=   X³-5X²+8X-17

2A=3B+2C
2(X³-3X²+8X-7)= 3(2X²+10)+2(4X³+X-14)
2X³-6X²+16X-14 = 6X²+30+8X³+2X-28
2X³-8X³-6X²-6X²+16X-2X-14-30+28=0
-6X³-12X²+14X-16=0


B .C 
(2X²+10).(4X³+X-14)=8X^5+2X³-28X²-40X³+10X-140
8X^5-38X³-28X²+10X-140