Question

URGENT ANSWER THIS plzzzzzzzz

Answer 1

Solution:-
given by ,

3x-7y = 10 ,xy= -1, find 9x^2 +49y^2


= (3x-7y)^2 = 9x^2 + 49y^2 -41xy

= 10^2 = 9x^2 + 49y^2 -41×(-1)

= 9x^2 + 49y^2 = 100-41

= (9x^2 + 49y^2 = 59)ans

Answer 2

$(3x - 7y)^{2} = 9 {x}^{2} + 49 {y}^{2} - 2 \times 3x \times 7y \\ {10}^{2} = 9 {x}^{2} + 49 {y}^{2} + 42 \\ 9 {x}^{2} + 49 {y}^{2} = 100 - 42 = 58$