Question

10. For what value of a if (x-4) a factor of 5x^3 - 7x^2 - ax - 28

Answer 1

Step-by-step explanation:

$when \: x = 4 \\ 5 \times {4}^{3} - 7 \times {4}^{2} - a \times 4 - 28 \\ 5 \times 64 - 7 \times 16 - 4a - 28 \\ 320 - 124 - 4a - 28 \\ 168 - 4a$

Answer 2

Answer:

Step-by-step explanation: