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evergirl

  • 3 years ago

Solve 5x2 = –45x.

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  1. Aditi_Singh
    • 3 years ago
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    \[5x^2 = -45x ?\] \[=> 5x = -45\] \[=> x = -9\]

  2. evergirl
    • 3 years ago
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    thanks!

  3. Hero
    • 3 years ago
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    No, you do not divide both sides by x. That is not the first step.

  4. Hero
    • 3 years ago
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    A Quadratic always has two solutions unless it is a perfect square.

  5. Hero
    • 3 years ago
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    \[ \\5x^2 = –45x \\5x^2 + 45x = 0 \\5x(x + 9) = 0 \\5x = 0 \\x + 9 = 0 \\x = 0 \\x = -9 \]

  6. Hero
    • 3 years ago
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    The rule is "Never divide by the variable you are trying to solve for".

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