You either mean 4k as an abbreviation for 4000 or 4K as an abbreviation for 4 Kelvin in which case it is equivalent to -269.15 degrees Celsius or -452.47 degrees Fahrenheit.
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4x-9=k 4x=k+9 Divide by 4 to isolate the x x=(1/4)k+(9/4) x=1/4 k+ 9/4
neg(-k) + neg(-k) = k + k = 2k = 4
is multiplication , so you multiply like k(9)=36 then k would equal k=4 because you divide 9 by 36 and it equals =4
x = ¼x^4 + 4x + k where k can be any number
√(40)=k√(10) Isolate k by dividing both sides by √(10) √(40)/√(10)=k √(40/10)=k √(4)=k k=2