Question

I need help with this problem.

If a * b = a2 -b 2. Find 3 * 2.
________
a + b

Answer 1

I' m attaching a file with 5 choices for this problem.

Answer 2

Hint:

\[\Large a * b = \frac{a^2-b^2}{a+b}\]

\[\Large 3 * 2 = \frac{3^2-2^2}{3+2}\]

Answer 3

so it would be -2

Answer 4

not quite

Answer 5

2 then

Answer 6

\[\Large 3 * 2 = \frac{3^2-2^2}{3+2}\]

\[\Large 3 * 2 = \frac{9-4}{3+2}\]

\[\Large 3 * 2 = \frac{5}{5}\]

\[\Large 3 * 2 = 1\]