Question

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

Answer 1

i hope this helps you

Answer 2

Quadratic formula for given equation is
`x=(-(-1)\pm√((-1)-4(7)(-9)))/(2*7)`

Explanation:

Given Quadratic Equation is 7x² = 9 + x

We need to find correct Quadratic formula for the given quadratic equation.

If the quadratic equation is in standard for,

ax² + bx + c = 0

then quadratic formula is given by,

`x=(-b\pm√(b-4ac))/(2a)`

First we rewrite the quadratic equation,

7x² - x - 9 = 0

by comparing with standard form of equation we get,

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

oNw putting these value in quadratic formula we get,

`x=(-(-1)\pm√((-1)-4(7)(-9)))/(2*7)`

Therefore, Quadratic formula for given equation is
`x=(-(-1)\pm√((-1)-4(7)(-9)))/(2*7)`