Question

(x+5) is a factor of 2x^3+5x^2-28x-15.
Hence, factorise the expression 2x^3+5x^2-28x-15 completely.

Answer 1

answer=0

Step-by-step explanation:

x+5=0

x= -5

2x^3+5x^2-28x-15

2(-5)^3+5(-5)^2-28*-5-15

-250+125+140-15

-125+125-15

15-15

=0

Answer 2

$\begin{array}{l}{\text { Evaluate }} \\ {\text { (i) } 2^{4} \times 2^{5} \text { (ii) } 2^{14}+2^{12} \text { (iii) } 12^{3} \times 3^{3}}\end{array}$