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

2 Answers

5 votes
I don't see any equation. However this equation can b written as follows

7x²=9+x
7x² - x - 9 = 0
User Hatem Alimam
by
8.3k points
3 votes
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=(-b+/-√(b^2-4ac))/(2a)


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


x=(-(-1)+/-√((-1)^2-4(7)(-9)))/(2(7)) would be the eqquation
but if you did want to solve

x=(1+/-√(253))/(14)
User Paul Walker
by
8.3k points

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