Question

3x² - 7 = 10 and xy = -1
Find 9x² + 49x²​

Answer 1

Step-by-step explanation:

7x+

2

1

)(7x−

2

1

)=49x

2

−b

⇒49x

2

−

4

1

=49x

2

−b (∵(a−b)(a+b)=a

2

−b

2

)

⇒b=

4

1