im guessing we use first.outer.inner.last for this, but i'm still having trouble with multiplying these polynomials:
(2x+5)(-3x^2+5x-4)
ty in adv

Question

anonymous · Answer

just mulyiply each term in the second bracket first by 2x then by +5 and then simplfy

anonymous · Answer

do u want me to demonstrate it?

anonymous · Answer

yes, please
ty

amistre64 · Answer

you use:  the distributive property.  Not some memory device to ingrain stupidity :)

anonymous · Answer

lol

anonymous · Answer

OK:

(2x X -3x^2) + (2x X 5x) + (2x X -4)  +  (5 X -3x^2) + (5 X 5x) + (5 X -4)
= -6x^3 + 10x^2 - 8x -15x^2 -25x - 20

= -6x^3 - 5x^2 -33x - 20

amistre64 · Answer

(2x+5)(-3x^2) + (2x+5)(5x) + (2x+5)(-4)

2x(-3x^2) +5(-3x^2) +2x(5x) +5(5x) +2x(-4) +5(-4)

-6x^3 -15x^2 +10x^2 +25x -8x +-20

-6x^3 -5x^2 +17x - 20 ... right?

anonymous · Answer

ty for the replies jimmyrep and amistre64
although both answers arent the same

amistre64 · Answer

jimmy did a human error, 5(5x) = 25x; not -25x :)  other than that he did quite well