math
posted by TUHITUHI .
what must be added to each of the following expressions to make it a whole square
(i) 4x^2  12x + 7
(ii) 4x^2  20x + 20

since
(2x3)^2 = 4x^2  12x + 9
(2x5)^2 = 4x^2  20x + 25
it should be clear.
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