y = 2*x^2 - 4

y = x^2 - 4*x + 1

IF a = b

AND a = c

THEN b = c

They failed to understand this...so,

IF 10 pennies = 2 nickels

AND 10 pennies = 1 dime

THEN 2 nickels = 1 dime

Some failed to understand this too...so,

IF 10 = 5 + 5

AND 10 = 2*5

THEN 5 + 5 = 2*5

Again, some failed to understand.

>_<