@comradetirer
A good thing is to actually explain why this works If a person really understands why something work they will alway be able to derive it
@heatheralicia5037
If anyone want to know it called vietas therom. -b/à is the sum of the solutions and c/a is the product
@jacek314
Damn, that's the first time I didn't know the easiest method right away, they didn't teach us this in school, thanks
@crazyivan5835
And, if you want to find m1 × m2 (the product), just use the formula c/a
@TickleBot32
Now how about this, by letting a and b be the roots, what is 1/a + 1/b without solving the equation
@spotlightfaithgroup1875
There's another easy way as well....2m2 dividing by 16 m2..cancel both m2....remain 2 divide by 16 = 8
@MuzHeppelwhite
since -b/2a is the midpoint in between the roots of a quadratic, it can also be called the average of the 2 roots since it lies in between with equal distance to each zero. since in the formula to find the average of n numbers we divide the sum of the numbers by n, we can remove the 2 from the midpoint formula since we are looking for the sum, not the midpoint, giving us -b/a
@dazedheart9006
Did not expect to learn something from a channel that answers SAT questions- 😭😭😭
@chance1986
It's obvious when you look at the quadratic formula, but I admit I haven't noticed this before. Very cool!
@valett5229
what's with the roots though? i can't quite imagine x1+x2=8, x1*x2=4
@ompatel5277
Use desmos
@DanCarloDioquino
Literally my teacher thought me this amonth ago and i already forgot it poor me quite sad since my favorite subject is math
@Kenzie_SLR23_ESP26B
-b±√b²-4ac/2a
@mikko_mikko_mi
I forgot viete theorem even existed
@cracklelacquer5602
If youre looking for "im asian and i learned this in 7th grade!!" Then you have found it, imagine calling x1+x2 = -b/a and x1*x2 = c/a "shortcuts" 😒
@potatogaming7044
Wait this is actually useful
@Ben-pf9wx
Easiest solution: DESMOS
@rndmvidsxoxo
How does 8 satisfy the equation?
@DextereusMarcus