Math

What's the answer to
1^2-(2-x)^2=2^2-x^2
The answer said x =7/4
But no matter how I tried. I couldn't get that

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asked by Claire
  1. 1^2-(2-x)^2=2^2-x^2
    1 - (4 - 4x + x^2) = 4 - x^2
    1 - 4 + 4x - x^2 = 4 - x^2
    4x = 7
    x = 7/4

    I don't understand why a textbook would write a term
    as 1^2 and 2^2 in an equation.
    That is just silly.

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    posted by Reiny
  2. Thank you. I forgot the brackets

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    posted by Claire

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