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For # 27-28, name the property used in each step.
27.
ab(a+b)=(ab)a+(ab)b
28.
= a(ab)+(ab)b
= (a.a)b+a(b.b)
=a²b+ab²
28.
3c+5(2+c)=3c+5 (2)+5c
= 3c+5c+5(2)
= (3c+5c)+5(2)
=(3+5)c+5(2)
= 8c+10
Sagot :
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