Question

plz give formulas fast as u can-
(a+b) (a-b)
(a-b) (a+b) ​

Answer 1

Answer:

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Step-by-step explanation:

$(a+b) (a-b) = a { }^{2} - b {}^{2} \\ \\ (a-b) (a+b) = a { }^{2} - b {}^{2}$

Answer 2

Answer:

Arithmetic progression

Consider the following arithmetic progression:

a + (a + d) + (a + 2d) + (a + 3d) + ...

Where:

a is the initial term

d is the common difference

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The nth term

The nth term, Tn of the arithmetic progression is:

Tn = a + (n - 1)d

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Sum of the first n term

The sum of the first n terms of the arithmetic progression is: