Question

1.Daca a + b =9 , c=5 Calculați ac+bc
2. Daca a-b=4 c=10 , Calculați ac-bc

Answer 1

ac + bc = c ( a + b ) = 5 * 9 = 45
ac - bc = c ( a - b ) = 10 * 4 = 40

Answer 2

1. ac+bc
a=9-b c=5
(9-b)× 5+ ( b ×5)=
9×5-b×5 +b×5=
45-5b+ 5b=45
ac+bc=45
2. a-b=4; c=10
ac-bc=?
a=4+b
(4+b)×10-(10b)=40+10b-10b=40
ac-bc=40