It is: 28-4-9 = 15
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25+15=40+9=49
-7 7b + 15 = (-34) 7b = (-34) - 15 7b =(-49) b = (-49) / 7 b= (-7)
It is because a whole number multiplied by itself does not equal 15. An example of a square number is 49. 7 times 7 equals 49.
It is 72 = 49.
Try: 15 times 49 = 735