X^3 - 21x = -20add 20 to both sidesx^3 - 21 x + 20 = 0Rational Root Theorem:Factors of P (constant) 20 = 1, 2, 4, 5, 10, 20------------------------------- Factors of Q (leading Coefficient) = 1
Possible zeros (all + -) 1/1, 2/1, 4/1, 5/1, 10/1, 20/1
Of the choices given only the number 1 is a possible root.
Answer:
134.189
Step-by-step explanation:
1+ 4x√7
√7 = 2.646
=4 x 2.646 = 10.584
1+10.584= 11.584
11.584 squared
=134.189
Answer:

Step-by-step explanation:
we know that
The area of the resulting two-dimensional cross-section is the area of a rectangle
The area of a rectangle is equal to

we have


substitute

Answer: x=5
Step-by-step explanation: Umm... I just solved it... yea...