Is -7x+21 the same as 21-7x
Answer provided by our tutors
Yes, -7x+21 is the same as 21-7x, that is:
-7x+21 = (-7x) + 21
Since the Commutative property of adding that states that 'a + b = b + a', if we put a = -7x and b = 21 we have:
a + b = (-7x) + 21
b + a = 21 + (-7x) = 21 - 7x
And that is exactly what is written above.