(y+4)²=y²+2y·4+4²=y²+8y+16(-3+a)²=(a-3)²=a²-6a+9(2x-y)²=(2x)²-2·2xy+y²=4x²-4xy+y²(-m-3n)²=(-m)²-2·(-m)·3n+(3n)²=m²+6mn+9n²(⅖x²+½y)²=(⅖x²)²+2·⅖x²·½y+(½y)²=4/25 x⁴ + 2/5 x²y + 1/4 y²(m²b⁴-na⁵)²=(b⁴m²-a⁵n)²=b⁸m⁴-2a⁵b⁴m²n+a¹⁰n²
