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

Asked by wiki @ 27/10/2020 in Mathematics viewed by 448 People

Answered by wiki @ 27/10/2020

For this case we have the following quadratic equation:
$7x ^ 2 = 9 + x
$
Rewriting the equation we have:
$7x ^ 2 - x - 9 = 0
$
The quadratic formula to solve the equation is:
$x = \frac{-b+/-\sqrt{b^2-4ac} }{2a}$
Where,
$a = 7

b = -1

c = -9$
Substituting values we have:
$x = \frac{-(-1)+/-\sqrt{(-1)^2-4(7)(-9)} }{2(7)}$
Answer:
An equation that shows the quadratic formula used correctly to solve is:
$x = \frac{-(-1)+/-\sqrt{(-1)^2-4(7)(-9)} }{2(7)}$

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