Question

Find (70^2– 69^2) + (68^2–67^2)+(66^2–65^2) +
+ (2²-1²)​

Answer 1

Step-by-step explanation:

(70²-69²)+(68²-67²)+(66²-65²)+(2²-1²)

Solving the expression by (a+b)(a-b),

=(70+69)(1)+(68+67)(1)+(66+65)(1)+(2+1)(1),

= 70+69+68+67+65+3,

=140+69+133,

=342.