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diamong [38]
3 years ago
12

Which equation shows the quadratic formula used correctly to solve 7x^2=9+x for x?

Mathematics
2 answers:
kogti [31]3 years ago
7 0
So first you need to get into form
0=ax²+bx+c
it is prefered that a is positive
so

7x²=9+x
minus (9+x) from both sides
7x²-1x-9=0

a=7
b=-1
c=-9

for 0=ax²+bx+c
x=\frac{-b+/-\sqrt{b^2-4ac}}{2a}


so, a=7
b=-1
c=-9

x=\frac{-(-1)+/-\sqrt{(-1)^2-4(7)(-9)}}{2(7)} would be the eqquation
but if you did want to solve
x=\frac{1+/-\sqrt{253}}{14}
elixir [45]3 years ago
3 0
I don't see any equation. However this equation can b written as follows

7x²=9+x
7x² - x - 9 = 0
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