Which number is rational , an integer , and a real number ?
2 answers:
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Step-by-step explanation:
Draw the triangle formed by the ray.
The hypotenuse of the triangle is:
c² = a² + b²
c² = (-5)² + (2√7)²
c² = 25 + 28
c = √53
Therefore:
cos β = -5 / √53
Or, as a proper fraction:
cos β = -5√53 / 53
If is a zero of
, then we can write
for another polynomial .
Note that . Then
so that is a root of
.