(x+1)(x+5)+4

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(x+1)(x+5)+4(x+1)(x+5)+4(x+1)(x+5)+4(x+1)(x+5)+4=x^2+5x+x+5+4=x^2+6x+9=(x+3)^2

(x+1)(x+5)+4
(x+1)(x+5)+4

(x+1)(x+5)+4
(x+1)(x+5)+4
=x^2+5x+x+5+4
=x^2+6x+9
=(x+3)^2

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