Question

.7. What should be subtracted from 15a4 – 3a3 + 25a - 40 to get 3a4+ 10a3 -12a - 20?​what is to be aubtracted from _ 15 to fet +1

Answer 1

Answer:

12a4 - 13a3 + 37a + 20 and 16

Step-by-step explanation:

Let X be subtracted by 15a4 - 3a3 + 25a - 40 to get 3a4 + 10a3 - 12a - 20.

So,

( 15a4 - 3a3 + 25a - 40 ) - X = ( 3a4 + 10a3 - 12a -20 )

=) ( 15a4 - 3a3 + 25a - 40 ) - ( 3a4 + 10a3 -12a - 20 ) = X

=) 15a4 - 3a3 + 25a - 40 - 3a4 - 10a3 + 12a + 20 = X

=) 15a4 - 3a4 - 3a3 - 10a3 + 25 a + 12a - 40 + 20 - = X

=) 12a4 - 13a3 + 37a + 20 = X.

-15 + 16 = +1