Explore Westonci.ca, the premier Q&A site that helps you find precise answers to your questions, no matter the topic. Experience the ease of finding precise answers to your questions from a knowledgeable community of experts. Discover detailed answers to your questions from a wide network of experts on our comprehensive Q&A platform.

Decide whether each of the following pairs of expressions are equivalent for all values of x. If they are equivalent, show how you can be sure. If they are not, justify your reasoning completely.
a. (x - 5)(2x + 7) and 2x^2 - 3x - 35
b. 3(x - 2)^2 + 6 and 3x² + 18​