(-4x^2+3xY-Y^2)(-7x^2-xy+6Y^2)(x^2+4xY-2y^2)
= -4x^2+3xY-Y^2-7x^2-xy+6Y^2+x^2+4xY-2y^2
= -4x^2-7x^2+x^2+3xY-xy+4xY-Y^2+6Y^2-2y^2
First of all I removed the brackets then combined the similar terms... now you just have to add the terms having same powers of x

Question

(-4x^2+3xY-Y^2)(-7x^2-xy+6Y^2)(x^2+4xY-2y^2) 
= -4x^2+3xY-Y^2-7x^2-xy+6Y^2+x^2+4xY-2y^2
= -4x^2-7x^2+x^2+3xY-xy+4xY-Y^2+6Y^2-2y^2
First of all I removed the brackets then combined the similar terms... now you just have to add the terms having same powers of  x

anonymous · Answer

Don't the parentheses imply multiplication?