Question

a) (+9a) + (+10a) - (+3b) - (-9b)
b) (-4x) - (-7y) + (-6y) - (-9x)
c) (7x+3) + (2x+1)
d) (x+3) - (x+5) + (x+3)
e) (3x²+ x - 1) + (2x²+2x + 5)
f) (8a+2b) + (2a - b) me ajudem pfvvv (35pontos)

Answer 1

A)
= (+9a) + (+10a) - (+3b) - (-9b)
= 9a+10a-3b+9b
= 19a+6b

b)
=(-4x) - (-7y) + (-6y) - (-9x)
= -4x +7y -6y+9x
= 9x- 4x + y
= 5x +y

c)
= (7x+3) + (2x+1)
= 7x+2x+3+1
= 9x+4

d)
= (x+3) - (x+5) + (x+3)
= x -x +x +3-5+3
= x+6-5
= x+1

e)
= (3x²+ x - 1) + (2x²+2x + 5)
= 3x^2 + 2x^2 +x+2x -1 +5
= 5x^2 +3x +4

f) (8a+2b) + (2a - b)
= 8a+2a+2b -b
= 10a+b