Question
If 8x2 + y2 β 12x β 4xy + 9 =
0, then the value of (14x β 5y) is :Solution
8xΒ²+yΒ²-12x-4xy+9 = 0 8xΒ²+yΒ²-12x-4xy+9 = 0 (2x-y) Β² + (2x-3) Β² = 0 β΄ 2x-3 = 0 β x = 3/2 2x-y = 0 3-y = 0β y= 3 β΄ (14x-5y) = 14Γ 3/2 β 5 Γ 3 = 21-15 = 6
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