3. Complete the multiplication table to determine each product.
a. 6u + 5 and 3u — 4
b. 7u - 6 and 7u - 8
a. (6u + 5)(3u - 4)
= 6u * 3u + 6u * -4 + 5 * 3u + 5 * -4
= 18u^2 - 24u + 15u - 20
= 18u^2 - 9u - 20
b. (7u - 6)(7u - 8)
= 7u * 7u + 7u * -8 + -6 * 7u + -6 * -8
= 49u^2 - 56u - 42u + 48
= 49u^2 - 98u + 48