For real numbers x and y, define x \spadesuit y=(x+y)(x-y). What is 3 \spadesuit (4 \spadesuit 5)?
Answer Choices
A. -72
B. -27
C. -24
D. 24
E. 72
For real numbers x and y, define x \spadesuit y=(x+y)(x-y). What is 3 \spadesuit (4 \spadesuit 5)?
Answer Choices
A. -72
B. -27
C. -24
D. 24
E. 72