Question

25x^2+64y^2-80xy when x=4 y=2

Answer 1

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25x² + 16y² - 80xy

=> 25 (4)² + 16 (2)² - 80 (4) (2)

=> 25 × 16 + 16 × 4 - 80 × 8

=> 400 + 64 - 640

=> -176


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