ب) $x^{2} + \frac{2}{3}x + \frac{1}{9} = x^{2} + 2(\frac{1}{3})x + (\frac{1}{3})^{2} = (x + \dots)^{2}$

پ) $4x^{2} - 4x + 1 = (\dots)^{2} - 2(2x) + (1)^{2} = (2x - \dots)^{2}$

ت) $y^{2} + 3y - 10 = y^{2} + (5-2)y - (5)(2) = (y - \dots)(y + \dots)$

ث) $9x^{2} + 18x + 8 = (3x)^{2} + 6 \times (3x) + 8 = (3x)^{2} + (\dots + \dots)(3x) + (2)(4) = (3x + \dots)(3x + \dots)$