Question

if 8x^2+y^2-12x-4xy+9find 14x-5y
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Answer 1

14x - 5y = 6 if 8x²  + y²  - 12x  - 4xy  + 9 = 0

Step-by-step explanation:

8x²  + y²  - 12x  - 4xy  + 9 = 0

=> 4x² + 4x² + y² - 12x - 4xy + 9 =0

=> 4x²  + y² - 4xy  + 4x²  -12x  + 9 = 0

=> (2x - y)²  + (2x - 3)² = 0

=> 2x - 3 = 0

=> x = 3/2

2x - y = 0

=> y = 2x

=> y = 2 * 3/2

=> y = 3

14x - 5y

= 14 * (3/2)  - 5(3)

= 21 - 15

= 6

14x - 5y = 6

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