Question

calcule: a) 2x-7+10=0
b)2x-10x-12=0
c)8x^2-7=0
d)1+12x=9x​

Answer 1

a) 2x-7+10=0

2x + 3 = 0

2x = - 3

x= - 3/2

b)2x-10x-12=0

- 8x - 12 = 0

- 8x = 12 (-1)

8x = - 12

x= - 12/8(÷4)

x= - 3/2

c)8x²-7=0

8x² = 7

x²= 7/8

x= ± √7/8

S= ( √7/8 , - √7/8)

d)1+12x=9x

12x - 9x = - 1

3x = - 1

x= - 1/3

Answer 2

Calcule:

a) 2x - 7 + 10 = 0

2x = 0 + 7 - 10

2x = - 3

x = - 3/2

S = {- 3/2}

b) 2x - 10x - 12 = 0

- 8x - 12 = 0

- 8x = 0 + 12

- 8x = 12 · (- 1)

8x = - 12

x = - 12/8 (÷ 4)

x = - 3/2

S = {- 3/2}

c) 8x² - 7 = 0

8x² = 0 + 7

8x² = 7

x² = 7/8

x = ± √7/8

S = {- √7/8, √7/8}

d) 1 + 12x = 9x

12x - 9x = - 1

3x = - 1

x = - 1/3

S = {- 1/3}