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sergij07 [2.7K]
2 years ago
13

If y is directly proportional to x^2 and y=18 and x=3,

Mathematics
1 answer:
Svetach [21]2 years ago
7 0

Answer:

Step-by-step explanation:

(i)

y=k*x^2\\\\if\ x=3, y=18 ==> 18=k*9\ ==> k=2\\\\Equation\ is:\ y=2x^2\\

(ii)

x=5 ==> y=2*5²=50

(iii)

32=2*x^2\\x^2=16\\x^2-4^2=0\\(x-4)(x+4)=0\\\\x=4\ or\ x=-4\\

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