How do you know if you cant factor a quadratic equation?

You can always factor a quadratic using the quadratic formula. Even if you're missing the b or the c. You can't be missing the a, since the a is the variable on the x-squared, which makes it a quadratic in the first place. You may end up with a negative under the square root sign which gives you complex solutions, but solutions nonetheless.

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)