bjr
x²+2x+1 = (x+1)²
x²+20x+100 = (x+10)²
x² - 6x + 9 = (x-3)²
x² + 12x + 36 = (x + 6)²
x² - 10x + 25 = (x-5)²
x² - 9x + 20,25 = (x-4,5)²
x² - 3x + 2,25 = (x - 1,5)²
x² + 3x + 2,25 = (x+1,5)²
x² + x + 0,25 = (x+0,5)²
x² - x + 0,25 = (x-0,5)²
x² + 3/2x + 9/16 = (x + 3/4)²
x² - 1/5x + 1/100 = (x - 1/10)²
(a+b)² = a² + 2ab + b²
(a-b)² = a² - 2ab + b²
