Find the value of x. (5x+15) (6x-10)

Mathematics

2 answers:

Annette [7]4 years ago

7 0

Answer:

We get x = -5/3 and x = -3

Step-by-step explanation:

$(5x+15) (6x-10)$

Multiplying this and equating to zero, to find x.

$30x^{2} -50x+90x-150=0$

$30x^{2} +40x-150=0$

Factoring out 10.

$3x^{2} +4x-15=0$

$3x^{2} +9x-5x-15=0$

3x(x+3)-5(x+3)=0 $[tex](3x-5)(x+3)=0$ [/tex]

We get x = -5/3 and x = -3

Blizzard [7]4 years ago

4 0

(5x+15)(6x-10)
= 30x^2 + 30x - 50x - 150
= 30x^2 - 20x - 150

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2 years ago

find the mean, range ,and median of these values 12,4,-2,0,9.-2,1,7,8,2 recall the range is calculated by finding the difference

Lubov Fominskaja [6]

Put numbers in order
-2,-2,0,1,2,4,7,8,9,12
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Range is the number of spots between -2 and 12 = 14
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3 years ago

Eric is adding water to a 60

Archy [21]

Answer:

After 2.5 minutes the pool will have 27 gallons of water.

Step-by-step explanation:

The pool has already 12 gallons of water and Eric wants to fill it to at least 27 gallons.

The water is flowing at a rate of 6 gallons per minute.

Let, after t minutes the pool will have at least 27 gallons of water.

Therefore, we can write the equation as

27 = 12 + 6t