Which equation shows the quadratic formula used correctly to solve 5x2 + 3x – 4 = 0 for x?

First option.

Step-by-step explanation:

For a quadratic equation of the form:

a*x^2 + b*x + c = 0

we have that the solutions for x are:

where we have two solutions, one for each sign of the square root.

then if our equation is:

5x^2 + 3x - 4 = 0

we have that 5 = a, 3 = b and -4 = c, then our equation is:

then the correct option is the first one.

19

step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft