Question

12. Simplify the expressions 3y ( 2y – 7 ) – 3 ( y – 4) – 63 and evaluate for y = -2​

Answer 1

Answer:

3y(2y - 7) - 3(y-4)-63........y= -2

Step-by-step explanation:

3y(2y - 7) - 3(y-4)-63

if [y= -2]

6y2 - 21 - 3y + 12 - 63

6y2-3y - 21 - 63

6y2 - 3y - 42

Answer 2

Answer:

$3y(2y - 7) - 3(y - 4) - 63$ $=6y^2 - 24y - 51$

For $y = -2$, $3y(2y - 7) - 3(y - 4) - 63 = 21$  

Step-by-step explanation:

$3y(2y - 7) - 3(y - 4) - 63$

$=6y^2 - 21y - 3y + 12 - 63$

$=6y^2 - 24y - 51$

For $y = -2$,

$6y^2 - 24y - 51 = 6.(-2)^2 - 24.(-2) - 51 = 24 + 48 - 51 = 21$