Question 422920
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Hi
Let x represent the number
Question states***Write as we Read
 4x^2 = 8x + 21
Solving for x
  4x^2 - 8x - 21 = 0
 {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
 {{{x = (8 +- sqrt( 400 ))/(8) }}}  
    x = {{{1+- 20/8}}}
    x  = 28/8 = 7/2
or x = -12/8 = - 3/2