need help explaining

Question

−7x(x− 2) + 2(x− 4)

-7x^2 - 14x + 2x - 8

-7x^2 - 12x - 8

 

i need help to explain. This problem and is there any mistakes about how I wrote the problem out?

Answer 1

Change the negative sign in front of 14x to +.  The correct simplified version of the original expression is then -7x² + 16x - 8.

Answer 2

−7x(x− 2) + 2(x− 4)

-7x*x - (-7x)*2 + 2*x - 2*4

-7x² + 14x + 2x - 8    (note that you got the sign wrong on the 14x)

 

-7x² + 16x - 8