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45 votes
What is the value of X? x(x² - 3x - 40) = 0

please show me how u solve it​

User Kek
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1 Answer

12 votes
12 votes

Answer: x = 0, 8, -5

Explanation:

We are trying to solve what value we substitute x into to get the value of 0. We have x outside of (x² - 3x - 40), and we can set that equal to 0. That will be one value of x because we are still left with (x² - 3x - 40). To solve this, we can factor it out into (x-8)(x+5). Set each equal to 0, (x-8) = 0 which leaves us with x = 8, and (x+5) =0, which leaves us with x = -5.

User MadLax
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