Answer:
-2x^2-5x+16
Step-by-step explanation:
Remove parenthesis:
-10x^2+9+8x^2-5x+7
Combine like terms:
-10x^2+8x^2-5x+9+7
= -2x^2-5x+9+7
=-2x^2-5x+16
Negative 5 squared is negative 25
Take 8/20 and multiply it by the number of minutes in an hour (60)
6/20 x 60/1
360/20
simplify. divide both numbers by the GCF, 20.
360/20 / 20/20
18/1
there are 18 minutes (1080 seconds) in 8/20 of a hour.
Answer:
x=8,-9
Step-by-step explanation:
