Question

Ajutați mă va rog. Îmi trebuie azi până la ora 14.

Answer 1

a) 7(3x-17)-5(4+x)=5

21x -119 -20-5x=5

16x -139=5

16x=5+139

16x=144

x=9

b)x/4+1/2=-1/6

x/4=-1/6-1/2

x/4=-1/6-3/6

x/4=-4/6

x=-4*4/6

x=-16/6

x=-8/3

c) 2x- (16-x)/3 =(x+3)/2 + 6  aducem la acelasi numitor si il eliminam.

12x-2(16-x) = 3(x+3) + 36

12x - 32 +2x= 3x + 9 +36

4x-3x=45+32

x=78

d) (2x-14)/3 - (3x-1)/5 = (x-2)/2

10(2x-14) - 6(3x-1) = 15(x-2)

20x-140 -18x +6=15x -30

2x-15x=-30+140-6

-13x=104

x=-8

e) (x+4)(x+1) -3(4x-7)=(x-6)^2

x^2+x+4x+4 -12x+21= x^2-12x+36

5x=36-25

5x=11

x=11/5

f) 14+(3x-2)^2 - 5(2x-1)^2 + (6x+9)(2x-2)=(x-2)^2

14+9x^2-12x+4 -5(4x^2-4x+1) +12x^2-12x+18x-18= x^2-4x+4

14+9x^2-12x+4-20x^2 +20x-5 +12x^2+6x-18=x^2-4x+4

14x+4x=4+18+5-4-14

18x=19

x=19/18