I need help with Precalculus.
#Ditzenel’s help with Precalculus.
gloomy fractal
post a screenshot of a few questions and your queries then ill help out
whole pollen
Ok.
gloomy fractal
yes
whole pollen
The first two pictures are connected. I don’t really get them at all.
gloomy fractal
so for f-g you need to find the value of f at a point on x and the value of g at a point on x, then connect them with a smooth line.
Example:
x=-2, f-g=-0.5
x=-1, f-g=1
x=0, f-g=1.5
x=1, f-g=2-1=1
x=2, f-g=1.5-2=-0.5
for height and weight you just substitute in your function for h so you get 40(t/9+3)-120, then you expand your brackets to get 40t/9+120-120=40t/9, and this gives you the weight of the boy as a function of his age
for average slope you would do rise over run on the interval [5,7], you know your run is equal to 7-5 and your rise is f(7)-f(5) so -42--20 so -22 (double negative is positive), which leaves you with -22/2 or -11
for the next question its a similar scenario, you do 7-6=1 and 1/7-1/6 where you cross multiply and get 6/42-7/42 so -1/42 which you now divide by 1 and get -1/42
gloomy fractal
thats absolutely fine
whole pollen
Okay. Wrote it down. Thanks for the help, Alex.
Now for the next part in my homework. I’ll bring up pictures next time if I don’t get them.
gloomy fractal
no problem
whole pollen
And it became more complicated since I was never taught any of this.
gloomy fractal
And it became more complicated since I was never taught any of this.
if the insides of a bracket are multiplied then you can just multiply the power of the bracket onto the exponent of each of the inside parts, and when dividing values of the same base you subtract the exponents
whole pollen
if the insides of a bracket are multiplied then you can just multiply the power ...
I see.
gloomy fractal
i can't help you with all of those unfortunately, pick a few really important questions and i can do those
gloomy fractal
for the top it becomes (x-0.5)^2-0.25+7 which becomes (x-0.5)^2 + 6.75
middle becomes -2x(12x-10x^2-30+25x) which is -2x(-10x^2+37x-30) which becomes 20x^2 - 72x + 60
bottom becomes x+7=(x+3)(x-3) which is x+7=x^2-9 which then goes to 0=x^2-x-16 where you can factorise to get (x-0.5)^2 - 0.25 -16 so (x-0.5)^2 - 16.25 = 0 so +/-sqrt(16.25)+0.5=x
whole pollen
Okay.