Объяснение:
1) 5x²+20x+20= 5( x² +4x +4) = 5(x+2)²
2) 2x² -12x +18 = 2(x²-6x +9) = 2(x-3)²
3) -3x² +18x-27 = -3(x² -6x +9) = -3(x-3)²
4) -2y²-16y-32 = -2(y² + 8y + 16) = -2(y+4)²
5) 6x² +12x +6 = 6(x² +2x +1) = 6(x+1)²
6) -10a² + 20a - 10 = -10(a²-2a+1) = -10(a-1)²
