We start with:
=>2c^2d-4c^2d^2⇒2c2d−4c2d2
Next, we identify terms that are similar:
=>color(orange)(2)color(blue)(c^2)color(red)(d)-color(orange)(4)color(blue)(c^2)color(red)(d^2)⇒2c2d−4c2d2
Let's start with color(orange)"orange"orange. We have 22 and 44 on opposite sides of the minus sign. The greatest common factor of these two values is 22, so that is what we factor out first. This will leave a 22 on the RHS of the minus sign.
=>color(orange)(2)(color(blue)(c^2)color(red)(d)-color(orange)(2)color(blue)(c^2)color(red)(d^2))⇒2(c2d−2c2d2)
Now let's look at color(blue)"blue"blue. We have the same term c^2c2 on both sides of the minus sign. So we can factor this term out.
=>2color(blue)(c^2)(color(red)(d)-2color(red)(d^2))⇒2c2(d−2d2)
Now the last type of term is color(red)"red"red. We have one term with a power of 11 and one term with a power of 22. With powers, we factor out the lowest power LL. Any terms with a power higher (say HH) than the lowest will be leftover with a power equal to H-LH−L. Let's factor out dd. Note! The term on the LHS of the minus sign will become 11, since there are no other terms left after factoring.
=>2c^2color(red)(d)(1-2color(red)(d))⇒2c2d(1−2d)
Now that we have touched all of the terms, we are finished. The factored version of the expression is:
=>2c^2d(1-2d)⇒2c2d(1−2d)