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AJUTOR:
A) (x+2)(3x+2)-3x=2x²+(x+1)²
B)x(1-x)+(2-x)²+(3+x)² -1=(x-1)(4-x)+(2x+1)(2+x)

Răspuns :

Renatemambouko
A) (x+2)(3x+2)-3x=2x²+(x+1)² 
3x²+6x+2x+4-3x=2x²+x²+2x+1
+6x+4-3x=+1
3x=-3
x=-1

B) x(1-x)+(2-x)²+(3+x)² -1=(x-1)(4-x)+(2x+1)(2+x)
x-x²+4-4x+x²+9+6x+x²-1=4x-4-x²+x+4x+2+2x²+x
x+4-4x+9+6x-1=4x-4+x+4x+2+x
3x+12=10x-2
7x=14
x=2