How can we find the number to add to $x^2-5x$x2−5x to make a perfect square trinomial?
Halve the coefficient of $x$x.
Square the coefficient of $x^2$x2.
Halve the coefficient of $x$x and then square it.
Square the coefficient of $x$x.
Find the missing values in this perfect square:
What term must we add to complete the square on $x^2+10x$x2+10x?
Determine the value of $c$c, the constant that should be added to $x^2-2x$x2−2x to make it a perfect square expression.