If triangle def has a 90° angle at vertex e, which statements are true?
(a) triangle def is an obtuse triangle.
(b) the angle at vertex d is acute.
(c) the angle at vertex f is obtuse.
(d) triangle def is a right triangle.
(e) the angle at vertex d is obtuse.

you are uyytr tyy

step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb

b. is true. hope this . happy