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29-10-2020
Mathematics

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When a number is subtracted from half of its own square the result is 60. What is the number?

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ashanti0221 ashanti0221

29-10-2020

Answer:

-10 or 12

Step-by-step explanation:

1/2 y2 -y =60

Multiply both sides by 2

y2 - 2y =120

Subtract 120 from both sides

y2 - 2y -120 = 0

Factor the left side ( y+10) (y -12 =0)

By zero product property, y= -10,12

So the number is -10 or 12

I don't if this was helpful sorry if its not

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