Question

If 1*2=1
2*3=-1
3*4=-5
find the value of 7*9=?
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Answer 1

sorry i dont know................

Answer 2

Answer:

answer is  -40

Step-by-step explanation:

2 -1square = 1

3 - 2 square = -1

4 - 3square = -5

then 9 - 7 square = -40