Question

a ) x² - 49 = 0
b) x² = 1
c) x² - 50 = 0
d) 7x² - 7 = 0
e) 5x² - 15 = 0
f) 21 = 7x²
g) 4x² - 27 = x²
h) x² - 7x = 0
i) x² + 5x = 0
j) 4x² -9x = 0
k) 3x² + 5x = 0
l) 4x² - 12x = 0
m) 5x² + x = 0
n) x² + x = 0
façam todas porfavor

Answer 1

Resposta:

Explicação passo a passo:

a.

x²-49=0

x²=0+49

x²=49

x=√49

x'=-7

x''=+7

S={-7,7}

b.

x²=1

x=√1

x'=+1

x''=-1

S={-1,1}

c.

x²-50=0

x²=0+50

x²=50

x=√50

x'=5√2

x''=-5√2

S={-5√2;5√2}

d.

7x²-7=0

7x²=0+7

7x²=7

x²=7/7

x²=1

x=√1

x'=1

x''=-1

S={-1;1}

e.

5x²-15=0

5x²=0+15

5x²=15

x²=15/5

x²=3

x'=√3

x''=-√3

S={-√3;√3}

f.

21=7x²

7x²=21

x²=21/7

x²=3

x=√3

x'=+√3

x''=-√3

S={-√3;√3}

g.

4x²-27=x²

4x²-x²=0+27

3x²=27

x²=27/3

x²=9

x=√9

x'=3

x''=-3

S={-3;3}

h.

x²-7x=0

x(x-7)=0

x=0

x-7=0

x=0+7

x=7

S={0,7}

i.

x²+5x=0

x(x+5)=0

x=0

x+5=0

x=0-5

x=-5

S={-5;0}

j.

4x²-9x=0

x(4x-9)=0

x=0

4x-9=0

4x=0+9

4x=9

x=9/4

S={0,9/4}

k.

3x²+5x=0

x(3x+5)=0

x=0

3x+5=0

3x=0-5

3x=-5

x=-5/3

S={-5/3;0}

l.

4x²-12x=0

x(4x-12)=0

x=0

4x-12=0

4x=0+12

4x=12

x=12/4

x=3

m.

5x²+x=0

x(5x+1)=0

x=0

5x+1=0

5x=0-1

5x=-1

x=-1/5

S={0;-1/5}

n.

x²+x=0

x(x+1)=0

x=0

x+1=0

x=0-1

x=-1

S={-1,0}