Alguien me ayuda con este problema de matematicas

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

A50% increase followed by 33 1/2% decrease

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12