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youngstar10

  • 2 years ago

What number must you add to complete the square? x2 + 14x = -7 A. 196 B. 49 C. 7 D. 14

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  1. myininaya
    • 2 years ago
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    \[x^2+bx+(b/2)^2=(x+b/2)^2\]

  2. myininaya
    • 2 years ago
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    so add to both sides \[(b/2)^2 \] can you guess what b should be?

  3. youngstar10
    • 2 years ago
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    14x ?

  4. myininaya
    • 2 years ago
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    well b is just the 14 bx is 14x but our formula calls for just b which is 14

  5. myininaya
    • 2 years ago
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    so plug 14 into that (b/2)^2 thing to figure out your answer as to what to add to both sides in order to complete the square

  6. youngstar10
    • 2 years ago
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    oh 196

  7. myininaya
    • 2 years ago
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    no

  8. myininaya
    • 2 years ago
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    \[(\frac{14}{2})^2 \] what is 14/2?

  9. youngstar10
    • 2 years ago
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    7 so the answer would be 49

  10. myininaya
    • 2 years ago
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    \[(\frac{14}{2})^2=(7)^2=49\] right

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