In order for a trinomial to be a perfect square trinomial, which of the following must be true about both the quadratic term and the constant term? aThey need to have different signs. bThe square of their sum must be twice the sum of their squares. cBoth terms must be perfect squares. dThe sum of their square roots must be odd.
Question
In order for a trinomial to be a perfect square trinomial, which of the following must be true about both the quadratic term and the constant term? aThey need to have different signs. bThe square of their sum must be twice the sum of their squares. cBoth terms must be perfect squares. dThe sum of their square roots must be odd.
Solution
The correct answer is c. Both terms must be perfect squares.
Here's why:
A perfect square trinomial is a trinomial that can be factored into the square of a binomial. This means it can be written in the form (ax+b)^2 or (ax-b)^2.
When expanded, these forms become a^2x^2 + 2abx + b^2 and a^2x^2 - 2abx + b^2 respectively.
From these forms, we can see that the quadratic term (a^2x^2) and the constant term (b^2) are both perfect squares.
Therefore, for a trinomial to be a perfect square trinomial, both the quadratic term and the constant term must be perfect squares.
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