A binomial squared (difference) is equal to the square of the first term, minus the double product of the first by the second, plus the square of the second term. In other words: $(a-b)^2=a^2-2ab+b^2$

When multiplying exponents with same base we can add the exponents

When multiplying exponents with same base you can add the exponents: $-4x^{5}y^3z^2yz$

When multiplying exponents with same base you can add the exponents: $-4x^{5}y^{4}z^2z$

The power of a product is equal to the product of it's factors raised to the same power