Question 288101
-3x(x+4) 
2x^3(x-3)= 
my answers were -12x+-3x^2 and -6x^3+2x^4 and I was marked wrong according to the algebra calculator I was right who is right the teacher or me.
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{{{-3x(x+4) = -3x^2 - 12x}}}
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{{{2x^3(x-3)= 2x^4 - 6x^2}}}
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What's an "algebra calculator?"
What did the teacher say the right answers are?