What number should be added to the expression x2 + 10x to change it into a perfect square trinomial?
a 5
b 10
c 25
d 100

C: 25 should be added;
the expression would become x^2 + 10x + 25, which can be factorised to (x + 5)^2

Where is the diagram?

You would need a laid out graph for this but could you provide a picture of just a graph? i can give stepssolve for y.subtract 4xdivide by -1 (opposites)graph slope intercept formcheck each point to see if it’s on the graph