Question

Need help with polynomials...



(a + b)(a2 - ab + b2)
a^3+ab2^+ab2-b3


(a - b)(a2 + ab + b2)
a3+ab2


I dont think im doing any of this right all the (a's,b's) really throw me off

Answer 1

(a + b)(a^2 - ab + b^2)

Alright what you do...is take the first term in the first set of parenthesis * 'a' in this case* and multiply it by every term in the second set of parenthesis....then do the same for the second term in the first set ...'b'

so we have

a * a^2 = a^3
a * -ab = -a^2b
a * b^2 = ab^2

then

b * a^2 = a^2b
b * -ab = -ab^2
b * b^2 = b^3

So altogether you have

a^3 - a^2b + ab^2 + a^2b - ab^2 + b^3
^ ^ ^ ^
cancel

a^3 + b^3 is your final answer for that first one...

Answer 2

can u help me

Answer 3

with what

Answer 4

my problem

Answer 5

what problem

Answer 6

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