isagg
Complete the square to form a perfect square trinomial.
x² + 4x + __



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amistre64
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how?

brinethery
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Take the middle term and divide it by 2. And then square it (^2). You'll get your last term.

amistre64
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thatll work ;)

amistre64
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another trick is to factor it:
(x)(x+4) and take that last number and spread it evenly between the two
(x+2)(x+2)

brinethery
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How would you factor x^2+4x+4?

brinethery
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Yup!

isagg
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is it 9?

brinethery
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4/2 = 2
2^2 = 4.
So: x² + 4x +4

isagg
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i see