Question

resolva as equacoes.a)√x+2=7,e sobre equacoes irracionais

Answer 1

a)(√x+2)²=7²
x+2=49
x=49-2
x=47

b)(√3x+1)+6=2
(√3x+1)=2-6
(√3x+1)²=(-4)²
3x+1=16
3x=16-1=15
x=15/3=5

c)(√5x-10)²=(√3x+2)²
5x-10=3x+2
5x-3x=2+10
2x=12
x=12/2=6

d)3(√3x+1)²=(√18)²
   3.(3x+1)=18
   9x+3=18
 9x=18-3
9x=15
x=15/9=5/3

e)(√3x+6)-2=x
(√3x+6)²=(x+2)²
3x+6=x²+4x+4
x²+4x+4=3x+6
x²+4x-3x+4-6=0
x²+x-2=0