Question

3x+18=x+40





2x-25=x-30





9x²-18=7x²+20





5x²-60=7x²+40+100






4x²+30=2x²+368




2x²+10=x²+410




4x+35-9=-19+2x+5




9x+12-6=4x-30+3

Answer 1

a) 3x+18=x+40
3x-x=40-18
2x=22
x=22/2
x=11
S={11}

b) 2x-25=x-30
2x-x=25-30
x=-5
S={-5}

c) 9x²-18=7x²+20
9x²-7x²=20+18
2x²=38
x²=38/2
x²=19
x=√19
S={√19}

d) 5x²-60=7x²+40+100
-7x²-140+5x²-60=0
-2x²-200=0
2x²=-200
x²=-200/2
x²=-100
x=√-100, não existe valores de x ∈ R que satisfaçam a equação.

e) 4x²+30=2x²+368
4x²-2x²=368-30
2x²=338
x²=338/2
x²=169
x=√169
x=13
S={13}

f) 2x²+10=x²+410
2x²-x²=410-10
x²=400
x=√400
x=20
S={20}

g) 4x+35-9=-19+2x+5
4x+26=2x-14
4x-2x=-26-14
2x=-40
x=-40/2
x=-20
S={-20}

h) 9x+12-6=4x-30+3
9x+6=4x-27
9x-4x=-6-27
5x=-33
x=-33/5
S={-33/5}


Renato.