Question 102612

{{{x^2+7x}}} Start with the given equation




Take half of the x coefficient 7 to get 3.5 (ie {{{7/2=3.5}}})

Now square 3.5 to get 12.25 (ie {{{(3.5)^2=12.25}}})




{{{x^2+7x+12.25}}} Add this result 12.25 to the current expression.



Now the expression {{{x^2+7x+12.25}}} is a perfect square trinomial.