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Пікірлер: 22
@ichdu671011 сағат бұрын
I've seen this trick very often on YT in the last months. really no one uses a very easy method to solve such an equation of third degree after multiplying the equation with -1 we receive: x³ - x² + 80 = 0 by inspection we found, that one solution is x = -4 Therefore x³ - x² + 80 = (x+4)(x² + ax + 20) the variable a can be found by comparing left and right side by writing the right side without the brackets
@StudentofgreatmagadhАй бұрын
I'm first here! 🥰
@learncommunolizerАй бұрын
🎉 Thank you very much!
@GladysDiku-kh6lcАй бұрын
5√4+y
@user-np4cy8dr8mАй бұрын
1 минута на подумать.
@user-kv5et4yu1lАй бұрын
сразу понятно, что Х должен быт отрицательным чётным числом: минус четыре: 16+64.
@davidcase4600Ай бұрын
You don't justify breaking 80 into 16 and 64. Why not 50 and 30. Using the answer we could guess is not math
@user-do5rq1yb3tАй бұрын
-4
@thomasharding1838Ай бұрын
you had the answer at 1 minute 20 seconds. X =-4 -4 times -4 =16. -4 times -4 times -4 = -64. 16 - (-64) =80 (not easy to type out clearly) He was just fitting in numbers to make it work, like @robertloveless4938 said. After all -15 plus -65 also equals -80 but that doesn't work in the equation. You either have to guess -4 or just keep trying numbers until it works.
@GladysDiku-kh6lcАй бұрын
4+y✓5+y
@MathSyncАй бұрын
i ❤ Mathematics
@marynjoroge5088Ай бұрын
I can’t do it
@marynjoroge5088Ай бұрын
Please I have never done these maths so remove it from me am understanding nothing
@miracbarsapaydn650Ай бұрын
X = -4
@yapadek3098Ай бұрын
sqrt(negative number)... When I was young I could be killed for this.
@user-jr3yt5ms3vАй бұрын
一目…
@robertloveless4938Ай бұрын
I cheated. I immediately knew x had to be negative, then I plugged in numbers, starting with -3 (answer =36), and worked the numbers. . Fortunately, I didn't have to go past 4.
@thomasharding1838Ай бұрын
You cheated no more than "Learncommunolizer did ! He had to know that X equaled -4 to plug in his equation at the 1:20 ish point. But YES, it was clear it had to be negative.
@Mal1234567Ай бұрын
Too easy. Solve X^3 - X^2 = 79 using REAL algebra.
@Mal1234567Ай бұрын
x^2 - 3^2 = 79; solve for x. No calculators please.
@mohamedzafir8566Ай бұрын
Square root of 70?
@Mal1234567Ай бұрын
@@mohamedzafir8566 Sorry, I mean to write X^3 - X^2 = 79