Which equation represents:
"an unknown integer, multiplied by two times itself, plus two times a different unknown integer, equals negative 20."
a) 2x^2 + 2xy + 20 = 0
b) 2x^2 + 2xy − 20 = 0
c) 2x^2 − 2xy + 20 = 0
d) 2x^2 − 2xy − 20 = 0

sum= when you add is how much the whole amount is

distance= when you use angles and it means how far it goes

step-by-step explanation:

option a, c,d are correct.

step-by-step explanation:

from the given figure, it is given that z is equidistant from the sides of the triangle rst, then from triangle tzb and triangle szb, we have

tz=sz(given)

bz=zb(common)

therefore, by rhs rule,δtzb ≅δszb

by cpctc, sz≅tz

also, from δctz and δasz,

tz=sz(given)

∠tcz=∠saz(90°)

by rhs rule, δctz ≅ δasz, therefore by cpctc, ∠ctz≅∠asz

also,from δasz and δzsb,

zs=sz(common)

∠zbs=∠saz=90°

by rhs rule, δasz ≅δzsb, therefore, by cpctc, ∠asz≅∠zsb

hence, option a, c,d are correct.