Steven180
Steven180 Steven180
  • 23-02-2016
  • Mathematics
contestada

what is 3k(-5k+21)+2(2.5k+90) <-- Confused please help

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apologiabiology
apologiabiology apologiabiology
  • 23-02-2016
use distributive prpoerty
a(b+c)=ab+ac

distribute each
3k(-5k+21)=-15k^2+63k

2(2.5k+90)=5k+180

so nowe we have
-15k^2+63k+5k+180
add like terms
-15k^2+68k+180
that is the answer
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