L
fatima evaluated the expression -1
when m=-2 and n=4. her work is shown below.
4m 3n-2
m-1
-4m 2-3
= 4(-2)2(4)-= (-8) ? (4) -
what was fatima's error?
she subtracted the exponents incorrectly when simplifying the expression
she substituted the wrong values for the variables.
she applied the exponent-2 to 4-2) instead of applying the exponent to just-2
she found an incorrect value for (-8)-2 since the value should be negative.