Digital SAT 2, Math Module 2H, Question 22 (xy-plane)

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[@_greened_5276]

**writing this before watching full video**. well that was easy. got "a" from the f(-9)=f(3) a=2/3. then i just got the parabola vertex Y formula which is D/4a and since k

[@SetteleTutoring]

I'm not sure I've ever heard of the vertex y formula, but if it worked, it works for me!

[@OverclockingCowboy]

@@SetteleTutoring
There is such a formula. But I think he is missing a negative sign. You can derive it by plugging x = -b/2a (the vertex) into the standard form. It is hardly ever used because you would do the same thing to find k. Plug back -b/2a into the equation.

[@nepalifreefiregaming8233]

the real way to solve 'c', i have nailed it. if k

[@SetteleTutoring]

I think you have the inequality symbol backwards.

[@nepalifreefiregaming8233]

@@SetteleTutoring as i learn from khan academy if both the sign cut out in (inequalities) question the sign change. That's the reason i had done like that.

[@MormotTheHog]

why if k

[@j-man4231]

@@MormotTheHog ya I don't get that either. I do not think that is a rule.

[@kundana3596]

do you have a video over all the important formulas to memorize

[@SetteleTutoring]

Yes, I do!
czcams.com/video/2ZitzLnIcQU/video.html