Question

without actual calculation find the value of 31sq-30sq

Answer 1

Hey there !

°•••••••••°

The answer is as follows :-

31²-30²

= (31+30)(31-30) = (61)(1) = 61

BECAUSE

(a+b)(a-b) = a²-b²

ANSWER IS 61

°••••••••••°

Hope it helps :-)