How To Solve Quadratic Expressions

Question

I need help with solving the quadratic expression 25x²-121 , how to I start ?

Answer 1

You have an expression. You can only solve equations, and equations have = signs. You want to factor the expression.

25x² - 121

(5x)² - 11²

Use the "difference of squares" factoring formula:

(a^{2 -} b²) = (a+b)(a-b)

where a = 5x and b = 11 in your problem.