Skip to main contentFind the value of the expression. 20⋅19−19⋅18+18⋅17−17⋅16- A36
- B144
- C70
- D ✓72
WORKED EXAMPLE
Solution
Group the terms and factor out the common factor: 20⋅19−19⋅18=19⋅(20−18)=19⋅2=38 and 18⋅17−17⋅16=17⋅(18−16)=17⋅2=34. The sum is 38+34=72. Solve today's problem