Germany | Can you solve this ? | Nice Math Olympiad Algebra Problem
2024 ж. 21 Сәу.
40 430 Рет қаралды
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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.
You don't justify breaking 80 into 16 and 64. Why not 50 and 30. Using the answer we could guess is not math
1 минута на подумать.
5√4+y
сразу понятно, что Х должен быт отрицательным чётным числом: минус четыре: 16+64.
4+y✓5+y
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I can’t do it
Please I have never done these maths so remove it from me am understanding nothing
-4
X = -4
sqrt(negative number)... When I was young I could be killed for this.
x^2 - 3^2 = 79; solve for x. No calculators please.
Square root of 70?
@@mohamedzafir8566 Sorry, I mean to write X^3 - X^2 = 79
Too easy. Solve X^3 - X^2 = 79 using REAL algebra.
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.
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.
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