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3 answers

4x^2+20x
=>(2x)^2+2.2x.5
Hence (5)^2 or 25 is to be added to it to make it a perfect square.
ts

2007-01-07 16:09:16 · answer #1 · answered by alpha 7 · 0 0

The square root of 4 x^2 is 2 x so there must be a 2 x term.
Then (2 x + 5)^2 = 4 x^2 + 20 x + 25. So the answer is 25.

2007-01-07 23:45:44 · answer #2 · answered by Joseph Binette 3 · 0 0

25.

4x² + 20x + 25 = (2x + 5)²

2007-01-07 23:46:12 · answer #3 · answered by Northstar 7 · 0 0

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