So I understand everything but I just want an easy way to go from the first one to the second one I circled them to show my problem is there any videos that shows how to do this ik it’s basic mathematics but I just forgot
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vagrant sentinelBOT
gritty tendon
So I understand everything but I just want an easy way to go from the first one ...
Yeah I mean this is something you just know
(a+b)(a^2-ab+b^2)=(a^3+b^3)
crimson parrot
Is the issue finding a factor or factorising after you found one
gritty tendon
You can verify that it's true but it's kind of a pattern recognition thing
gritty tendon
Is the issue finding a factor or factorising after you found one
Yeah I think they're just asking how you get from x^3+8 to the stuff on the right
crimson parrot
(a+b)(a^2-ab+b^2)=(a^3+b^3)
This is a nice to know thing that can come up again
gritty tendon
Yeah
crimson parrot
Is the issue finding a factor or factorising after you found one
That has 2 parts to it imo, these
gritty tendon
That has 2 parts to it imo, these
I think factoring does but in the explicit example they showed with the numerator and denominator those are things to memorize
Difference of squares and sum of cubes
Though okay its pretty trivial to get there without memorizing the formula too
For x^3+8=0
x^3=-8
x=-2
So you know (x+2) is a factor
You can use synthetic division or long division or wtv to get the other factor