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What is the discriminant of the quadratic equation 
7x^(2)-7x-8=0 ?
273

-175
175

-273

What is the discriminant of the quadratic equation 7x27x8=0 7 x^{2}-7 x-8=0 ?\newline273273\newline175 -175 \newline175175\newline273 -273

Full solution

Q. What is the discriminant of the quadratic equation 7x27x8=0 7 x^{2}-7 x-8=0 ?\newline273273\newline175 -175 \newline175175\newline273 -273
  1. Identify coefficients: Identify the coefficients of the quadratic equation.\newlineThe general form of a quadratic equation is ax2+bx+c=0ax^2 + bx + c = 0. For the given equation 7x27x8=07x^2 - 7x - 8 = 0, the coefficients are:\newlinea = 77 (coefficient of x2x^2)\newlineb = 7-7 (coefficient of xx)\newlinec = 8-8 (constant term)
  2. Recall discriminant formula: Recall the formula for the discriminant of a quadratic equation. The discriminant of a quadratic equation ax2+bx+c=0ax^2 + bx + c = 0 is given by the formula D=b24acD = b^2 - 4ac.
  3. Substitute into formula: Substitute the identified coefficients into the discriminant formula.\newlineUsing the coefficients from Step 11, we substitute them into the discriminant formula:\newlineD=(7)24(7)(8)D = (-7)^2 - 4(7)(-8)
  4. Calculate discriminant: Calculate the discriminant.\newlineNow, we perform the calculations:\newlineD=494(7)(8)D = 49 - 4(7)(-8)\newlineD=49+224D = 49 + 224\newlineD=273D = 273

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