distributive property
a(b+c)=(a)(b)+(a)(c)
note that (a)(b)=a times b
an example:
2(3+4)=(2)(3)+(2)(4)=6+8=14
for negative stuff
-2(3+4)=(-2)(3)+(-2)(4)=-6-8=-14
2(3-4)=(2)(3)+(2)(-4)=6-8=-2