Question

Vă rog ajutați-mă!!!!URGENT!!!!

Answer 1

Sper ca ai inteles ce am scris. Succes!

Answer 2

a)2x-3=3x-2

-3=3x-2-2x

-3=x-2

-3+2=x

-1=x

x=-1

b)x+7=3•(2x-1)+5

x+7=3•(2x+4)

x+7=6x+12

7=6x+12-x

7=5x+12

7-12=5x

-5=5x

-1=x

x=-1

$c) \frac{x + 2}{2} - \frac{x - 1}{4} = \frac{7}{4} \\ \\ 2(x + 2) + 1 - x = 7 \\ \\ 2x + 4 + 1 - x = 7 \\ \\ x + 5 = 7 \\ \\ x = 7 - 5 = 2$

d)5-2x=3-2•(x-1)

5-2x=3-2x+2

5-2x=2x-5

-2x=-2x

Număr infinit de soluții.

e)x•(x-2)-17=(x+1)²+2x

x²-2x-17=x²+2x+1+2x

x²-2x-17=x²+4x+1

-2x-17=4x+1

-17=4x+1+2x

-17=6x+1

-17-1=6x

-18=6x

$- \frac{18}{6} = x$

-3=x

x=-3

$f) \sqrt{ {x}^{2} + 4x + 4 } = 7 \\ \\ \sqrt{ {x}^{2} + 2(x)(2) + {2}^{2} } = 7 \\ \\ \sqrt{ {(x + 2)}^{2} } = 7 \\ \\ x + 2 = 7 \\ \\ x = 7 - 2 = 5$
h)|x+3|=8

x+3=8

-(x+3)=8

x=8-3=5

-x-3=8

-x=8+3=11

x=-11