Question

If 3x - 7y = 10 and xy = -1, find the value of 9x² + 49y²

Answer 1

Answer:

If 3x - 7y = 10 and xy = -1, find the value of 9x² + 49y²

$46 { - \sqrt{49} }^{2}$

Answer 2

Answer:

210 IS THE VALUE OF 9x²+49y²

Step-by-step explanation:

(3x+7y)=10

{squaring both sides}

(3x+7y)²=(10)²

(3x)²+(7y)²+2*3x*7y=100   {(a+b)²=a²+b²+2ab}

9x²+49y²+42xy=400

9x²+49y²+42*-1=400

9x²+49y²-42=400

9x²+49y²=168+42

9x²+49y²=210

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