Show that (2a-1)^2-(2b=1)^2=x(a-b)(a+b-1) where x is an integer to be found.

i do not know this sorry : (

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.

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