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ValentinkaMS [17]
3 years ago
9

Solve kx + 9 = 7 for x.

Mathematics
2 answers:
Helga [31]3 years ago
7 0
Answer:
X= -2/k

Explanation:
Kx+9=7
*subtract 9 from both sides*
Kx= -2
*divide both sides by k*
Kx/k = -2/k
*divide -2 by k*
X= -2/k
elena55 [62]3 years ago
6 0
Kx+9=7
Kx=-2 (subtract 9 from both sides)
X=-2/k (divide k from both sides.
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3 years ago
How do I do this? Please explain in detail.
umka2103 [35]
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multiply by x-6
=> (x-6)22.5/(x-6) + (x-6)22.5/(x+6) = 9(x-6)
=> 22.5 + (x-6)22.5/(x+6) = 9(x-6)
multiply by x+6
=> (x+6)22.5 + (x+6)(x-6)22.5/(x+6) = 9(x-6)(x+6)
=> (x+6)22.5 + (x-6)22.5 = 9(x-6)(x+6)
distribute
=> 22.5x+6(22.5) + 22.5x - 6(22.5) = 9(x^2 - 36)
=> 45x = 9x^2 - 9(36)
=> 0 = 9x^2 - 45x - 9(36)
divide by 9
=> 0 = x^2 - 5x - 36
=> 0 = x^2 - 5x - 36
=> 0 = (x - 9)(x + 4)
x=9 and -4
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3/2 is the answer
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