Question

Calculos: a) 5x-(9x-5)+6= (b)2ab+(ab-8)+3= c)x+7+(8x-5)+2x2=

Answer 1

a

5x - ( 9x - 5) + 6 =
5x - 9x + 5 + 6 =
-4x + 11 =
-4x = - 11
4x = 11
x = 11/4 ****

b
2ab + ( ab - 8 ) + 3 =
3ab - 5 = 0
3ab = 5
ab= 5/3 ***

c
x + 7 + (8x - 5 ) + 2x² =
2x² + 9x + 2 = 0
delta = 81 - 16 = 65 ou +-V65
x = ( -9 +-V65)/4
x 1 = ( 9 +V65)/4
x2 = ( 9 - V65)/4