Question

if one pen costs Rs (3x²+2x +7), what is the cost of 2x such pens​

Answer 1

Step-by-step explanation:

$one \: pen \: = 3 {x}^{2} + 2x + 7 \\ \\ \\ 2x \: pen \: = \: 2x(3 {x}^{2} + 2x + 7) \\ \\ 2x \: pen \: cost = 6 {x}^{3} + 4 {x}^{2} + 14x$