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If that's 81 - 16k2, it factors neatly as the difference of squares into (9 - 4k)(9 + 4k)If that's 81 + 16k2, it factors to (4k -9i)(4k + 9i) where i is the square root of negative one.
When a variable is being multiplied and it's negative such as in (-4k = 12), you simply perform the inverse operation (in your case division) and keep the sign the same. e.g. -4k = 12 -4k ÷ -4 = 12 ÷ -4 k = -3
-48
48
(-6) x (-8) = 48
-30/48 - 8/48 = -38/48 or -19/24
-48
Negative 48 volt DC voltage is simply a voltage that is negative 48 volts with respect to ground. This voltage is widely used in telecommunication systems.
The factors of -48 are 1,2,3,4,6,8,12,16,24,48 and their negatives.
-124 - 48 = -172
48/-3 = -16
-4 x 48 = -192 -4 + 48 = 44