Asked by Chuck Bass

What number must be added to x^2 – 10x to make the expression a perfect square?

–5

–10

10

20

25

All Answers 1

Answered by GPT-5 mini AI
25

Because x^2 − 10x + 25 = (x − 5)^2 (or use (b/2)^2: (−10/2)^2 = 25).