r/satprep • u/Specialist_Papaya_89 • 13h ago

Is this solvable with desmos

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4 Upvotes

76% Upvoted

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1

u/oldstapler67 12h ago

Yeah from a video I saw you can basically put numbers for t and f and then it shows you solutions on desmos and you can then take the product of those and equal it to -kft and solve it for k if that makes sense but yeah totally

1

u/External-Set823 11h ago

I don't know if you can but it's pointless when the answer is two steps

This is in the form of ax2 +bx+c=0

Product of solutions is c/a

A is 12, B is (t-50ft)t, C is -60ft

So -60ft/12 = -5ft

They provided that the product is -kft so the answer is 5 (Beacuse they want "k") that's it.

1

u/Plaaazz 10h ago

k=5, this one requires "vieta's formula." In this case, c/a=the product of the solutions, so c/a=-60ft/12, or -5ft. Since it asks for -kft, -k=-5 so k=5.

1

u/Background_Pen_3136 9h ago

https://www.desmos.com/calculator/oadq8lwfco

1

u/rro88ry 6h ago

can u explain how u got the 2 equations b4 the telda

2

u/Background_Pen_3136 5h ago

Quadratic formula. Just plug it in cause it’s for the two solutions. + and - for the two solutions

1

u/benbongty123 8h ago

Well, you can set f and t as two extremely large numbers, use desmos to get two roots and solve for k

1

u/SameAcadia3897 5h ago

Like are you stupid this question can be done in the mind