Question

Evaluate $b^2-4ac$ for $a=-1,b=-4,c=5$.
Is the value that was returned to you positive,negative, or zero?

Answer 1

Hey!

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Solution:

$= b^2 - 4ac\\= (-4)^2 - 4(-1)(5)\\= 16 - 4(-5)\\= 16 - (-20)\\= 16 + 20\\= 36$

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Answer:

36

The value that was returned to you was positive!

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Hope This Helped! Good Luck!