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Which of the following trinomials can be factorised as a perfect square of a binomial?

Answer and explanation

Correct answer: \(9p^2+12pq+4q^2\)

Answer: A. Use \((u+v)^2=u^2+2uv+v^2\). In A, \(9p^2=(3p)^2\), \(4q^2=(2q)^2\), and the middle term is \(2(3p)(2q)=12pq\). Hence \(9p^2+12pq+4q^2=(3p+2q)^2\). Option B has 5q², but the square of 2q must give 4q². Option C has a negative final term, so it does not match a binomial square with these outer terms; the sign pattern is also inconsistent. Option D has equal-looking coefficients but is not the square of a binomial: the first and last terms would suggest \(\sqrt6p\) and \(\sqrt6q\), whose cross-term would be 12pq, but the resulting form is not the stated standard integer binomial square. Check the outer squares and exactly twice their product.

Related tags

Perfect Square TrinomialFactorisationAlgebraic IdentitiesBinomial SquareExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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