Algebra-1

To expand the expression (x + 1)(x² - 4x - 21), we can use the distributive property and multiply each term of the first expression by each term of the second expression:

(x + 1)(x² - 4x - 21) = x * (x² - 4x - 21) + 1 * (x² - 4x - 21)

Expanding further:

= ...