Question

Help please 102533 ajuta.ma la ex 7

Answer 1

a) (2*9+1)x+3=9+5
19x+3=14
19x=14-3
19x=11
x=11/19

b) x*x=0+0
x^2=0
x=0

c) (3-2x)*x= -4-1+3x
3x-2x^2= -5+3x
-2x^2+3x-3x= -5
-2x^2= -5
x^2= 5/2
x=√5/√2 rationalizam cu √2
x= √10/2

d) 15-2x*(3x+3)=3x*(x-2)-3-7
15-6x^2-6x=3x^2-6x-10
-6x^2-3x^2-6x+6x= -10-15
-9x^2= -25
x^2= 25/9
x=√25/9
x=5/3

e) (2+3x)x+3=3x^2+3
2x+3x^2+3=3x^2+3
3x^2-3x^2+2x=3-3
2x=0
x=0