Recognize that the expression \( [(2m+7) - n]^2 \) is a perfect square of a binomial, which can be expanded using the formula \( (a - b)^2 = a^2 - 2ab + b^2 \).
Identify \( a = (2m + 7) \) and \( b = n \) in the expression \( [(2m+7) - n]^2 \).
Expand \( (2m + 7)^2 \) using the formula \( (x + y)^2 = x^2 + 2xy + y^2 \), where \( x = 2m \) and \( y = 7 \).
Write the full expanded expression by combining all terms: the square of \( 2m + 7 \), the product term \( -2(2m + 7)n \), and the square of \( n \).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Binomial Expression
A binomial is an algebraic expression containing two terms connected by a plus or minus sign. In this problem, (2m + 7) - n is a binomial because it combines two terms, (2m + 7) and -n, which can be simplified or manipulated using algebraic rules.
Squaring a binomial means multiplying the binomial by itself, such as (a - b)^2 = (a - b)(a - b). This expands to a^2 - 2ab + b^2, which is a key formula used to simplify expressions like [(2m + 7) - n]^2.
Solving Quadratic Equations by Completing the Square
Distributive Property
The distributive property allows you to multiply each term inside a parenthesis by a term outside or in another parenthesis. It is essential for expanding products like (a - b)(a - b) by distributing each term properly to simplify the expression.