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Ber [7]
3 years ago
11

Which equation shows the quadratic formula used correctly to solve 7x2 = 9 + x for x?

Mathematics
2 answers:
abruzzese [7]3 years ago
4 0
The equation should be 7x^2 -x-9=0
Mashutka [201]3 years ago
4 0

Answer:

The equation x=\frac{-(-1)\pm \sqrt{(-1)^2-4(7)(-9)}}{2(7)} shows the quadratic formula used correctly to solve the given equation.

Step-by-step explanation:

If a quadratic equation is defined as ax^2+bx+c=0, then the quadratic formula is

x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}

The given equation is

7x^2=9+x

Subtract 9 and x from both the sides.

7x^2-x-9=0

Here, a=7, b=-1 and c=-9.

Substitute  a=7, b=-1 and c=-9 in the quadratic formula.

x=\frac{-(-1)\pm \sqrt{(-1)^2-4(7)(-9)}}{2(7)}

Therefore the equation x=\frac{-(-1)\pm \sqrt{(-1)^2-4(7)(-9)}}{2(7)} shows the quadratic formula used correctly to solve the given equation.

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Answer:

Step-by-step explanation:

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1

and substituting this solution into the remaining two equations

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