Expand.
a) 3(y-7)
b)-4k(2k+6)
c)4b(b2-2b+5)
a) To expand 3(y - 7), you simply distribute the 3 to both terms inside the parentheses. This means multiplying 3 by y and then multiplying 3 by -7.
So, 3(y - 7) would become 3y - 21 after expanding.
b) Similarly, to expand -4k(2k + 6), you distribute the -4 to both terms inside the parentheses. This means multiplying -4 by 2k and then multiplying -4 by 6.
So, -4k(2k + 6) would become -8k^2 - 24k after expanding.
c) To expand 4b(b^2 - 2b + 5), you distribute the 4b to all three terms inside the parentheses. This means multiplying 4b by b^2, then by -2b, and finally by 5.
So, 4b(b^2 - 2b + 5) would become 4b^3 - 8b^2 + 20b after expanding.