Question

Resolva cada equação do 1° grau 1+2a-(2-3a)= -21

Answer 1

Resposta:

2/3a+1/2a=21

2/3a+1/2a-(21)=0

a!=0/3

a!=0

a∈R

a!=0/2

a!=0

a∈R

4a/6a^2+3a/6a^2-21=0

4a+3a-21*6a^2=0

7a-21*6a^2=0

-126a^2+7a=0

a = -126; b = 7; c = 0;

Δ = b2-4ac

Δ = 72-4·(-126)·0

Δ = 49  

a1=−b−Δ√2aa2=−b+Δ√2a

Δ−−√=49−−√=7

a1=−b−Δ√2a=−(7)−72∗−126=−14−252=1/18

a2=−b+Δ√2a=−(7)+72∗−126=0−252=0

Explicação passo a passo: