(5a+1)²=25a²+10a+1 (3y-4)²=9y²-24y+16 (10+4c)²=100+80c+16c² (2x-3y)²=4x²-12xy+9y² (5a+6b)²=25a²+60ab+36b² (-3c+a)=9c²-6ab+a²