Question

Find value of 36x^2+49y^2-84xy , if x =2 and y=-2

Answer 1

If any doubts plz comment below....

Answer 2

$\textbf{Answer :}$

Let,

f (x, y) = 36x² + 49y² - 84xy

So, f (2, - 2)

= 36 (2²) + 49 (- 2)² - 84 (2) (- 2)

= 36 (4) + 49 (4) - 84 (- 4)

= 4 (36 + 49 + 84)

= 4 (169)

= $\textbf{676}$

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