Which statement explains how you could use coordinate geometry to prove the diagonals of a quadrilateral are perpendicular?
use the slope formula to prove the slopes of the diagonals are the same.
use the slope formula to prove the slopes of the diagonals are opposite reciprocals.
use the distance formula to prove the lengths of the diagonals are the same.
use the distance formula to prove the midpoints of the diagonals are the same.

option b is correct.

step-by-step explanation:

we have to prove that diagonals of a quadrilateral are perpendicular

the diagonals are perpendicular if the slopes of the diagonals are:

m₁ = -1/m

so, use the slope formula to prove the slopes of the diagonals are opposite reciprocals.

hence option b is correct.

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a