CPM Homework Help : PC3 Problem 1-28

Is the equation $(3x+2)^2=9x^2+4$ always, sometimes, or never true? Explain.

Hint:

Complete the generic rectangle below. What is missing?

Generic rectangle, top & left edge, each labeled, 3, x + 2. Interior top left labeled, 9 x squared, bottom right labeled, 4.

More Help:

The equation will be true if $x$ is a certain value. What is this value?