Question

1 si 2 .Multumesc ,dau coronita

Answer 1

1. (a+1)x²-3ax=17a
(a+1)*(-3)²-3a*(-3)=17a
(a+1)*3²+9a=17a
(a+1)*9+9a=17a
9a+9+9a=17a
18a+9=17a
18a-17a=-9
a=-9


2. a) 3x-2(x+8)=4 =) 3x-2x-16=4 = ) x-16=4 = ) x=4+16 = ) x=20
b) 2(x+1)-1=2x+1 = ) 2x+2-1=2x+1 = ) 2-1=1 = ) 1-1 = ) x ∈ R
c) 3(x+5)-2(x-1)=x = ) 3x+15-2x+2 = x = ) x+17=x = ) 17=0 = ) x ∈ Ф
d)  1+x/2=x/3 =) 6+3x=2x = ) 3x-2x = -6 = ) x=-6
e)  (x+2)²=x²+4 = ) x²+4x+4=x²+4  = ) 4x=0 = ) x=0
f)  (2x-3)²=(2x+1)(2x-1) = ) 4x²-12x+9=4x²-1 =) -12x+9=-1
=) -12x = -1-9 = ) -12x=-10 = ) x = 5/6