Срочно. Помогите. ..........................................

Question

Срочно.

Помогите.

..........................................

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Answer 1

(7-х)(7+х) + (х+3)^2 = 49 - х^2 + х^2 + 6х + 9=

58 + 6х
х = -3.5 ; 58 + 6 * (-3.5) = 58 + (-21) = 37