Here are some formulas that are commonly used in solving algebra questions.
Note that the equations below can work vice versa.
Square of binomials :
To square a binomial, you square the first term, take twice the product of the two terms and take the square of the second term.
Difference of two squares :
A formula easy to remember, when you see that both the terms are squares, and the sign is a minus, this formula can be applied to solve the equation.
Sum and Difference of two cubes.
Square of trinomials.
To square a trinomial, firstly, take the sum of the square of all three terms, also sum up twice the value of ab, ac and bc respectively.
Cube of trinomials.
To cube a trinomial, firstly take the sum of the cubes of all three terms, also sum up thrice the value of (a+b)(b+c)(a+c).
For those who want to learn more, below are some formulas that are useful in the future :
P.S. you might want to try this:
1) , using basic formulae :D