anonymous
  • anonymous
What is the discriminant for the quadratic expression? 18x2 + 11x A. 49 B. 121 C. 193 D. 280
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
discriminant = b² - 4ac y = ax² + bx + c is the quadratic equation, so you have a = 18, b = 11, c = 0
anonymous
  • anonymous
hld on sec
Mertsj
  • Mertsj
Discriminant is b^2-4ac

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Mertsj
  • Mertsj
\[ax^2+bx+c\] \[18x^2+11x+0\]
Mertsj
  • Mertsj
a=18 b=11 c=0
Mertsj
  • Mertsj
Calculate b^2-4ac
UsukiDoll
  • UsukiDoll
the discriminant formula is b^2-4ac find the values based on the the standard quadratic equation ax^2+bx+c let a = 18,b=11, c =0 and plug it into the formula
anonymous
  • anonymous
47x
UsukiDoll
  • UsukiDoll
we should just have a number after calculating the discriminant
anonymous
  • anonymous
47
anonymous
  • anonymous
b² - 4ac = 11² - 4(18)(0)
anonymous
  • anonymous
The part after the subtraction sign comes out to 0 so you're left with 11²
UsukiDoll
  • UsukiDoll
anything multiplied by 0 is 0 so we are left with 11^2-0 =11^2 what's 11 x 11 ?
anonymous
  • anonymous
121
UsukiDoll
  • UsukiDoll
yes that's correct
anonymous
  • anonymous
thanks very much

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