Answer: (x+7)(x-7)
how to get answer:
x^2-49 rewrite as
x^2-7^2
use diff of perf squares: a^2-b^2=(a+b)(a-b)
(a=x, b=7)
fill in the formula of the parenthesis
(x+7)(x-7)
to check you answer is correct, you can foil the answer (x+7)(x-7)
The initial stages of human embryogenesis.
8-cell embryo, at 3 days.
Blastocyst with an inner cell mass and trophoblast.
Trophoblast differentiation.
Histogenesis of the three germ layers.
Artificially colored - gestational sac, yolk sac and embryo (measuring 3 mm at 5 weeks)
Embryo attached to placenta in amniotic cavity.
Those plants and animals which are over
utilized are: Rhinoceros, Sea mink, Passenger pigeon, Tecopa pupfish, Pyrenean
ibex and Tasmanian tiger.
<span>The plants and animals which are almost gone out
existence or they are already extinct because humans are over using them are
utilized species (animals and plants).</span>
The simplest answer is that these all have a backbone/notochord and all have internal skeletons of some type,
The correct answer to your question is Tobacco Smoke. Hope this helps you out please let me know.
Definition of Carcinogens- <span>a substance capable of causing cancer in living tissue. Also known as black smoke in the lungs.</span>
