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

Step-by-step explanation:

Given:

Standard form of quadratic equation:

Quadratic formula:

where,

Substitute the value into formula

Hence, All the above steps to solve for x using quadratic formula.

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)