\[\begin{array} { rr } {\text { If } a , b , c \text { are real numbers, then }} &{a ( b + c ) = a b + a c} \\ \\{ \text { Also,} } &{( b + c ) a = b a + c a} \\ {} &{a ( b - c ) = a b - a c } &{} \\{... If a,b,c are real numbers, then a(b+c)=ab+ac Also,(b+c)a=ba+caa(b−c)=ab−ac(b−c)a=ba−ca
