Given : -4 $1 = 4, 7 $ -7 = 49 and 3 $ 1 = -3 If we replace '$' with '×' and multiply the product with '-1', then we will get the desired result. Eg :- (−4 × 1) × (−1) = 4 and (7 × −7) × (−1) = 49 and (3 × 1) × (−1) = −3 Similarly, (−8 × −5) × (−1) = −40