What are the zeros of the polynomial function?

Mathematics

1 answer:

Serga [27]4 years ago

4 0

First compute the discriminant delta:
9^2-4*1*20=1.
Using the quadratic formula, we get the solutions:
$\frac{-9-1}{2} =-5\\ \frac{-9+1}{2}=-4$
the solutions are then -4 and -5.

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rugs Emporium installs carpet for $80 plus $9.50 per square yard of carpet carpets 4 U charges $120 for installation and $7.50 p

mihalych1998 [28]

The area of the carpet must be greater than 20 square yards for which Rugs Emporium charges more than Carpets 4U.

Explanation

Suppose, the number of square yards of carpet is $x$

Rugs Emporium charges $80 plus $9.50 per square yard of carpet. So, the total charge for $x$ square yards of carpet $= (80+9.50x) dollar$

Carpets 4U charges $120 for installation and $7.50 per square yard of carpet. So the total charge for $x$ square yards of carpet $=(120+7.50x) dollar$

If the Rugs Emporium charges more than Carpets 4U , then the inequality will be.....

$80+9.50x>120+7.50x\\ \\ 9.50x-7.50x>120-80 \\ \\ 2x>40\\ \\ x>20$

So, the area of the carpet must be greater than 20 square yards for which Rugs Emporium charges more than Carpets 4U.

5 0

3 years ago

A circular swimming pool is 21 feet in diameter. What is the circumference

meriva

Answer:

66 feet

Step-by-step explanation:

diameter = 21 feet

circumference of circle = 2πr or πd

circumference of swimming pool = 22/7 * 21

= 22 * 3

= 66 feet

Hope this year is useful!!

4 0

3 years ago

Factor completely. 3x^2 −147=

erica [24]

Answer:

$3(x - 7)(x+7)$

Step-by-step explanation:

To factor this, you must first take out the GCF (Greatest Common Factor), that $3x^2$ and -147 both have. The terms only have 3 in common, which can be divided with