Book Maths Puzzle Quadratic Equations

"express x^2 - 10x + 25 in the form (x - h)^2"

Read Solution (Total 1)

x^2 - 10x + 25
=X^2-(2.x.5)+5^2
=(x-5)^2
so, h=5
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Book Other Question

A lab technician has one solution that is 60% chlorinated and another that is 40% chlorinated. How much of each solution is needed to make a 100 L solution that is 50% chlorine? "where would you expect the vertex on the graph of y = (x - 4)^2 + 5 to be?"