How Do You Simplify and Classify the Polynomial 4x^2(–2x^2 + 5x^3)?

[jellerboo]

Write 4x^2(–2x^2 + 5x^3) in standard form. Then classify it by degree and number of terms.
a.
2x + 9x^4; quintic binomial

b.
20x^5 – 8x^4; quintic binomial

c.
2x^5 – 8x^4; quintic trinomial

d.
20x^5 – 10x^4; quartic binomial

if someone could help me change it to standard form asap that would be super
thanks!

 

[courtrigrad]

why isn't it b? multiply it out.

 

[jellerboo]

okay ill try again
i just keep getting different answers

 

[HallsofIvy]

Yes, it's not b: because (4)(5)= 20, not 2! And what is (4)(-2)?

 

[jellerboo]

thanks for the tips
this is my first time posting and ill try to make things easier to read
ill also try not to give up

 

[jellerboo]

quintic binomial =]

 

[HallsofIvy]

Are you sure you've copied the answers correctly? "-8x^4" would make a whole lot more sense than "-8^4"!

(You edited to make it clearer. Did the 'x' disappear when you did that?)