Pre-Calculus

It may look lame but I can't work out how to solve (-9) sqrt(4-x^2) = 4x + 5sqrt2. I need some guidance, please.

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asked by Helga
  1. First divide both sides by -9

    sqrt(4-x^2) = 0.444x - 0.1571

    Then square both sides and solve the resulting quadratic equation

    posted by drwls

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