Question

Which expressions are equivalent?

A.3x + 5x and 8x

B.3(x + 4) and 3x + 12

a + b + a and 2a + b

m − n and − n + m

18x + 2y and 15x + 3x + 2x

3a + 4a − 10 and 17a

Answer 1

a) 3x + 5x = 8x
b) 3(x+4) = 3x + 12
c) a+b+a = 2a + b
d) m - n = m - n or -n + m (because, 3 - 10 = -7 also -10 + 3 = -7)
e) 18x + 2y = 18x + 2y
f) 3a + 4a - 10 = 7a - 10
The expressions a), b), c), and d) are equivalent.