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Elina [12.6K]
3 years ago
6

Which equation has the components of 0 = x2 – 9x – 20 inserted into the quadratic formula correctly? x = StartFraction negative

9 plus or minus StartRoot (negative 9) squared minus 4(1)(negative 20) EndRoot Over 2(1) EndFraction x = StartFraction 9 plus or minus StartRoot (negative 9) squared minus 4(1)(20) EndRoot Over 2(1) EndFraction x = StartFraction 9 plus or minus StartRoot (negative 9) squared minus 4(1)(negative 20) EndRoot Over 2(1) EndFraction x = StartFraction negative 9 plus or minus StartRoot (negative 9) squared + 4(1)(negative 20) EndRoot Over 2(1) EndFraction
Mathematics
2 answers:
AnnZ [28]3 years ago
7 0

Answer:

x=\frac{9+/-\sqrt{(-9)^2-4\,(1)\,(-20)} }{2\,(1)}

Step-by-step explanation:

Recall that the quadratic formula gives you the pattern to follow in order to find the solutions to a quadratic equation of the form: ax^2+bx+c=0

It tells us that we need to use the parameters a,\, b, and c in the following formula in order to get the answers for the x-values that solve it:

x=\frac{-b+/-\sqrt{b^2-4\,a\,c} }{2\,a}

so, in our case, a=1, b=-9, and c=-20

then, replacing these values in the formula, we obtain:

x=\frac{-b+/-\sqrt{b^2-4\,a\,c} }{2\,a}\\x=\frac{-(-9)+/-\sqrt{(-9)^2-4\,(1)\,(-20)} }{2\,(1)}\\x=\frac{9+/-\sqrt{(-9)^2-4\,(1)\,(-20)} }{2\,(1)}

Which looks like the third expression you are listing (although it is a little hard to read)

Readme [11.4K]3 years ago
5 0

Answer: C

Step-by-step explanation: No cap

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