3 years ago

Let x △ y be defined by x △ y=x−5y. What is the value of 3 △ (−4)

1 answer:

5 0

$x\Delta y=x-5y\\\\3\Delta(-4)\qquad\text{put the values x = 3 and y = -4 to the expression x - 5y}:\\\\3\Delta(-4)=3-5(-4)=3+20=23$

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