What number should be added to the expression x2 + 4x to change it into a perfect square trinomial?

asked Dec 15, 2018 149k views

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4. Then you have x^2+4x+4 which gives you (x+2)(x+2) when you factor it.

Yiyi You answered Dec 18, 2018

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ax^2+bx+x=0 so divide it by two
x^2+4x+4(b=4, 4/2 is 2 and 2^2 is 4 that's the number

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