Question

find all pairs of integers that give a product of (-90)
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Answer 1

Answer:

(-1,  90), (-2, 45), (-3, 30), (-5, 18), (-6, 15), (-9, 10), (1,  -90), (2, -45), (3, -30), (5, -18), (6, -15), (9, -10)

Step-by-step explanation:

This is simply the factors of -90

Factors of 90:  (1,  90), (2, 45), (3, 30), (5, 18), (6, 15), (9, 10)

to get a negative number anyone of the number in the pair must be negative and there are two possibilities (i) first one is negative (ii) second one is negative.

∴the required pairs are (-1,  90), (-2, 45), (-3, 30), (-5, 18), (-6, 15), (-9, 10), (1,  -90), (2, -45), (3, -30), (5, -18), (6, -15), (9, -10)