Express (a+3)(a-4) as a trinomial

Answer

Step-by-step explanation:

One way is to ensure that each term in the second bracket is multiplied by each term in the first bracket, as shown below.

(a+3) - (a - 4)

=a(a−4)+3(a−4)

distribute the brackets.

=−+−12

collecting like terms gives.

= − − 12 ← as a trinomial

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m