Steven180 Steven180

23-02-2016
Mathematics

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

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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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