Math question

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1

<p>I need your help.</p>

<p>From blue book </p>

<p>The square of x is equal to 4 times the square of y.If x is 1 more than twice y, what is the value of x?</p>

2

<p>We have :

  • x^2 = 4y^2 (1)
  • x = 2y + 1 (2)</p>

<p>(2) <=> 2y = x-1
<=> 4y^2 = (x-1)^2
<=> 4y^2 = x^2 - 2x + 1</p>

<p>Apply 4y^2 = x^2 -2x + 1 to (1)
<=> x^2 = x^2 - 2x + 1
<=> 2x = 1
<=> x = 1/2 = .5</p>