Question

What must be added to 20xsquare - 20x + 20 to make it a perfect square​

Answer 1

Answer:

9 ✔

Step-by-step explanation:

4x^2+20x+16

(2x)^2 + 2 × 2x × 5 + 25 = (2x+5)^2

so ...

25-16 = 9

so 9 must be added to get a perfect square.!

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