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3 years ago

How do you factor the trinomial 3x^2+18x-21?

Mathematics

1 answer:

snow_lady [41]3 years ago

7 0

Answer:

(3)(x+7)(x-1)

Step-by-step explanation:

3x^2+18x-21

Let's start by taking 3 out of the equation.

3(x^2+6x-7)

Now, when we factor, we need to find two numbers that add up to 6 and multiply to -7.

The numbers would be 7 and -1.

So the factored form of this would be:

(3)(x+7)(x-1)

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Jim’s allowance is $1.20 per week. Stan’s is 25¢ per day. How long will they have to

algol [13]

First, find out how much stan gets per week.

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now how much they get together

1.75 + 1.20 = 2.95

and then the final step

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3 years ago

An epidemiologic survey of roller-skating injuries in Metroville, a city with a population of 100,000 (during the midpoint of th

Ahat [919]

Answer: c. $\dfrac{90}{1800}\times100\%$

Step-by-step explanation:

As per given , we have

Total number of residents injured from roller-skating =1,800

Total number of deaths from roller-skating = 90

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= $\dfrac{90}{1800}\times100\%$

= 5%

Hence, the correct answer is c. $\dfrac{90}{1800}\times100\%$

8 0

4 years ago

(3x^2 + 2x -2) + ( -2x^2 + 5x+5) My answer 5x^2 + 7× +7 Am i right

sertanlavr [38]

$(3x^2 + 2x -2) + ( -2x^2 + 5x+5)=\\
3x^2 + 2x -2 -2x^2 + 5x+5=\\
x^2+7x+3$

4 0

3 years ago

Algebra hcf 10xyz and 15y²z²

boyakko [2]

Answer:

5yz

Step-by-step explanation:

1st expression=10xyz

=5*2*x*y*z

2nd expression=15(y)2 (z)2

=5*3*y*y*z*z

therefore H.C.F=5yz

underlines are taking common.

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3 years ago

How to divide 394.6 and 9

Lina20 [59]

The answer is 43.44 the 4 at the end repeats

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3 years ago