Question

Multiply: (4c - 9)(c^2 + c - 7).

Answer 1

4c*c*c + 4c*c - 4c*7 - 9*c*c - 9*c + 7*9 = 4c^3 + 4c^2 - 28c - 9c^2 - 9c + 63 = 4c^3 - 5c^2 - 37c + 63

Answer 2

u have to multiply 4c with c^2,
then put an addition sign
next, multiply 4c with c
and then put a negative sign and multiply 4c with 7

next focus on the number -9
since its a minus sign, keep the - in mind.
multiply -9 with c^2
then multiply (-9) with c, ( this is minus 9c)

now multiply -9 with -7, this is +63

This gives u,
(4c)(c)(c) + (4c)(c) - (4c()7) - (9)(c)(c) - (9)(c) + (7)(9)
4c^3 + 4c^2 - 28c - 9c^2 - 9c + 63
4c^3 - 5c^2 - 37c + 63