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Пікірлер: 9
@willberry31992 ай бұрын
There are three solutions. It is valid for "t" to be negative because we are solving for x, not for its square root. Continuing that third line we end up with x = (3 - sqrt(5)) / 2 which can be verified in the original equation without any square roots of negative numbers.
@seringoften2 ай бұрын
can you explain it more simply sorry i don't understand to that 😅
@willberry31992 ай бұрын
@@seringoften In the video he stopped calculating one solution after finding t was negative, but he should have kept going, it leads to a third valid solution.
@oleglevchenko9072 ай бұрын
No, x = (3 - sqrt(5)) / 2 ≈ 0.382 is NOT solution. Just try to verify it with a calculator: x*sqrt(x)≈0.236, and x+sqrt(x)=1.
@gloystar2 ай бұрын
Solved it before playing the video in exactly the same way. Turned out the solutions were (zero) and the (square of the golden ratio). Great video.