There are three laws of indices that need to be remembered to simplify any expression with different indices.

a^m*a^n = a^(m+n)

a^m/a^n = a^(m - n)

(a^m)^n = a^(m*n)

The quadratic formula that gives the roots of a quadratic equation ax^2 + bx + c = 0 is:` x1 = (-b + sqrt(b^2 - 4ac))/(2a)` and `x2 = (-b - sqrt(b^2 - 4ac))/(2a)`

This is quite a simple formula with the roots differentiated only by the sign before the term `sqrt(b^2 - 4ac)` . Solve a few problems using the formula and you will remember it.

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