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Given $f(x)=5x^2+6x-7$

  1. Solve for $x$ if $f(x)=0$ correct to two decimal points
  2. Hence, or otherwise, calculate the value of $d$ for which $5x^2+6x-d=0$ has equal roots
in Mathematics by Diamond (60,538 points) | 34 views

1 Answer

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1. use quadratic formula

   x= 0.73 or x= -1.93

2. b^2 - 4ac = 0 for equal roots

    6^2 - 4 x 5 x (-d) = 0

        36 + 20d=0

                 20d= -36

                      d= -36/20  = 1  4/5
by Diamond (42,256 points)

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