How to know when to use middle term splitting in factorisation?

well after factorization u will get the quotient which r 3 terms u should use it there and it also depends upon question and marks

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it