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Sa se restranga ca patratul unei sume sau diferente:
3x² +2√ ̅6x+2=
5+2√ ̅15x+3x² =
3-4√ ̅3x+4x² =
5x² -4√ ̅5x+4=

1\4x² +3x+9=
x² +2\3x+1\9=
1\9x² -4\3x+4=
x² -4√ ̅5+1\4=


Răspuns :

3x² +2√ ̅6x+2= (√3x +√2)²
5+2√ ̅15x+3x² = (
√5 + √3)²
3-4√ ̅3x+4x² = (
√3 - 2x)²
5x² -4√ ̅5x+4= (
√5x - 2)²
1\4x² +3x+9= ( 1/2 + 3)
²
x² +2\3x+1\9= ( x + 1/3)
²
1\9x² -4\3x+4= ( 1/3x - 2)
²
x² -x+1\4= (x - 1/2)²