Question

Resolva:
a) ( 2x² - 9x + 2 ) + ( 3x² + 7x – 1 ) =


b) ( 6x² - 6x + 9 ) – ( 3x² + 8x – 2 ) =


c) ( 7x – 4y + 2 - ( 2x – 2y + 5 ) =



d) ( 15 a – 7b + 4c ) + ( 8b + 3 c – 9a ) =

Answer 1

Resposta:

a) ( 2x² - 9x + 2 ) + ( 3x² + 7x – 1 ) =

$2x^{2} -9x+2+3x^{2} +7x-1=5x^{2} -2x+1$

b) ( 6x² - 6x + 9 ) – ( 3x² + 8x – 2 ) =

$6x^{2} -6x+9-3x^{2} -8x+2=3x^{2} -14x+11$

c) ( 7x – 4y + 2 - ( 2x – 2y + 5 ) =

$7x-4y+2-2x+2y-5=5x-2y-3$

d) ( 15 a – 7b + 4c ) + ( 8b + 3 c – 9a ) =

$15a-7b+4c+8b+3c-9a=6a+b+7c$