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What is the main difference between ( (2x+3)(2x-3) ) and ( (2x-3)^2 )?

Answer and explanation

Correct answer: The first is a difference of squares, whereas the second gives a perfect-square trinomial

The first expression contains conjugate binomials:

(a+b)(a-b)

. Hence, using

(a+b)(a-b)=a^2-b^2

,

(2x+3)(2x-3)=4x^2-9

; there is no middle x-term. The second expands as

(2x-3)^2=4x^2-12x+9

, which is a perfect-square trinomial and has the middle term

-12x

. Therefore, option A is correct; option C reverses the two identities. Exam tip: recognise

(a+b)(a-b)

as a difference of squares and

(a-b)^2

as a perfect square.

Related tags

Algebraic IdentitiesDifference Of SquaresPerfect SquareBinomial ExpansionClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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