Answer:
2 solutions
Step-by-step explanation:
x^4-6x^2-7=0
Replace x^2 by y
(x^2)^2-6x^2-7=0
y^2-6y-7=0
D=b^2-4ac= (-6)^2-4*1*(-7)= 36+28=64
sqrtD=8
y1=(-b-sqrtD)/2a=-2/2=-1
y2= (-b+sqrtD)/2a=14/2=7
x^2=-1(n0 roots) x^2=7 x=sqrt7 or x=-sqrt7
2 roots
Largeur = x
longueur = 4 x
2 ( x + 4 x) = 20
2 x + 8 x = 20
10 x =20
x = 2
largeur = 2 et longueur = 8
Answer:
C. 5,166
Step-by-step explanation:
because of the word product, it means multiplication
Answer: The maximum length that can be used is 56 inches.
Step-by-step explanation:
Since we have given that
Width of package = 14 inch
Height of package = 12 inch
Let the length of package be 'l'.
Combined length and girth i.e. distance around = 108 inches.
So, According to question, we get that

Hence, the maximum length that can be used is 56 inches.