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5² +2*5*b +b²
25 +10b +b²
2) (x+3) ² = x² +2*3*x +3²
= x² +6x+9
3) (2a+b)3 = (2a)³ +3(2a)²(b) +3(2a)(b)² +b³
= 8a³ +12a²b +6ab² +b³
4) (5x-y)³ = ( 5x)³ +3(5x)²(y) +3(5x)(y)² +y³
= 125x³ + 75x²y + 15xy² +y³