If X : Y = 4 : 3, find the ratio (3X2-2Y2)(3X2+2Y2).
Explanation:
X/Y = 4/3
⇒ X= 4Y/3
⇒ X2 = (16Y2)/9
Then, (3×169Y2-2Y2)(3×169Y2+2Y2)=10Y222Y2=511 or 5 : 11.
Hence, option (c).
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