Question

a)X²+2=18
b)²-4=21
c)X-6=13
d)X+77=-3
e)X²-81=0
f)3X-4=X+3
g)2(3X+6)=30
h)4(5X-0)=20
i)5X-1=3X+23

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Answer 1

Resposta:

a) 4

b) 5

c) 19

d) - 80

e) 9

f) 7/2

g) 3

h) 1

i) 12

Explicação passo-a-passo:

a)X²+2=18

x² = 18 - 2

x² = 16

x = 4

b)x²-4=21

ײ = 21 + 4

x² = 25

x = 5

c)X-6=13

x = 13 + 6

x = 19

d)X+77=-3

x = -3 -77

x = - 80

e)X²-81=0

x² = 81

x = 9

f)3X-4=X+3

3x - x = 3 + 4

2x = 7

x = 7/2

g)2(3X+6)=30

6x + 12 = 30

6x = 30 - 12

6x = 18

x = 18/6

x = 3

h)4(5X-0)=20

20x - 0 = 20

x = 20/20

x = 1

i)5X-1=3X+23

5x - 3x = 23 + 1

2x = 24

x = 12