check # 7,9,14
#7 is way off, there should have been 3 terms.
do those again.
I am really lost on all of those 3 problems.
-3x^2(4x^2-3x-5) just expand
= -12x^4 + 9x^3 + 15x^2
= 6a^4 - 6a^2 - 2a^2 + 2
= 6a^4 - 8a^2 + 2
= (3x^2 - 2x)(3x^2 - 2x)
= 9x^4 - 6x^3 - 6x^3 + 4x^2
= 9x^4 - 12x^3 + 4x^2
OHHH now I get it!
thank you very much!
can u hlep me
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