Question

Se considera numerele A=a²+x+2, B=3a²+2x-7 și C=4x+12.
Calculati:
a) A+B
b)A-B
c)A+B+C
d)A+(B-C)
e)-A+B-C
f)(A-B)+(B-C)+(C-A)

Answer 1

a) A+B=a^2+3a^2+X+2x+2-7=4a^2+3x-5 "^" la puterea .....

Answer 2

A=a²+x+2

B=3a²+2x-7

C=4x+12
a) A+B=a²+x+2+3a²+2x-7 =4a²+3x-5

b)  A-B=a²+x+2-3a²-2x+7=-2a²-x+9

c) A+B+C=a²+x+2+3a²+2x-7+4x+12 =4a²+3x-5+4x+12=4a²+7x+7

d) a²+x+2+[(3a²+2x-7) -(4x+12)]=a²+x+2+(3a²-2x-19)=4a²-x-17

e) -a²-x-2+3a²+2x-7-4x-12=2a²-3x-21

f)(A-B)+(B-C)+(C-A)=2a²-x+9+[(3a²+2x-7) -(4x+12)]+[(4x-12- a²-x-2

=2a²-x+9+(3a²-2x-19)+(3x-14-a²)

=4a²-24

=4(a²-6)