Question

Solve This q and answer it in full explanation​

Answer 1

Step-by-step explanation:

$7 {x}^{2} (3x - 9) \\ 21 {x}^{3} - 63 {x}^{2} \\ 21( {4})^{3} - 63 ({4})^{2} \\ 21 \times 64 - 63 \times 16 = 336$

$21( {6})^{3} - 63( {6})^{2} \\ 21 \times 216 - 63 \times 36 = 2268$

Answer 2

Step-by-step explanation:

7x^2 (3x-9) +3

at x=4

7(4)^2 (3(4) -9) +3

7(256) (12-9) +3

7(256) (3)+3

= 5379

at x=6

7(6)^2 (3(6)-9)+3

7(46,656) (18-9)+3

7(46,656) (9)+3

= 2939331