What number should be added to the expression x squared+2x to change it into a perfect square trinomial?

You know that a perfect square trinomial is given by square of first term, twice the product of first and last terms and square of second term

So we have x^2 that is square of x, 2x that is twice the product of x*1, the second term shoulf be 1, that is square of 1

So your answer would be 1

If you try (x+1) ^2 = x^2+2x+1

The perfect square trinomial (x + 1) ² equals

x² + 2x + 1

Therefore the answer is to add 1 to the expression.

Good luck