Question

Expressões algébricas: A)20+(3x-4)+7x= B)8x²-6-(5-7x²)= C)5x+(7x-12)-(20+4x)= D)15a+10-3a+1=

Answer 1

a) 20+3x-4+7x = 0
10x = -20+4
10x = -16
x= -1,6

b) 8x²-6-5+7x² = 0
15x²-11=0
a=15, b=0 c=-11
DELTA = -4.15.(-11)
DELTA =660.

x=+RAIZ660/30 = APROX 0,85

c) 5x+7x-12-20-4x = 0
8x - 32 = 0
x = 32/8
x=4

d) 15a+10-3a+1 = 0
12a + 11 = 0
a = -11/12


ESPERO TER AJUDADO!