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Novay_Z [31]
3 years ago
12

I need help I just don't understand

Mathematics
2 answers:
natali 33 [55]3 years ago
5 0

Answer: 9/7 or -5/2

Step-by-step explanation:

We can only factorise quadratics if they're in the format ax^2 + bx + c

Re-arranging the equation gives 14x^2 + 17x - 45 = 0

Factorising this quadratic gives:

(7x - 9)(2x + 5) = 0

There are numerous ways to factorise quadratics, using a calculator or via alternate methods you may have learnt in class. (E.g. 2 numbers multiply to make (14 * -45) and add up to make (17).

This gives us our solutions.

x = 9/7 or x = -5/2

maria [59]3 years ago
5 0

Answer:

See below.

Step-by-step explanation:

First, move all the terms to one side so we have only a zero on the right:

6x^2-17x+13=20x^2-32\\-14x^2-17x+45=0\\14x^2+17x-45=0

(I divided everything by negative 1 in the third step. This is optional, but I like having the first term positive.)

Now, we just need to factor it. To factor, what you want to do is find two numbers a and b such that:

When a and b is multiplied together, they equal the first coefficient and constant multiplied together.

And when a and b is added together, they equal the second term.

In other words, we want to find two numbers that when multiplied equals 14(-45)=-630 and when added equals 17. Then, we can substitute this into the 17. You do this by guessing and checking. It's useful to have a calculator.

After a bit, you can find that 35 and -18 works. Thus:

14x^2+17x-45=0\\14x^2+35x-18x-45=0\\7x(2x+5)-9(2x+5)=0\\(7x-9)(2x+5)=0

Now, the finish the problem, we just need to use the Zero Product Property and solve for x:

2x+5=0\\x=-5/2\\\\7x-9=0\\x=9/7

Note: This only works for quadratics.

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Is 2,925 more than 2,9250
k0ka [10]

Answer: 32,175

Step-by-step explanation:

2,925 + 29,250 = 32,175

hope this helps

plz mark brainleist

3 0
3 years ago
How to write 32,005,008 in expanded form?
Anna [14]
32,005,008 = 30,000,000 + 2,000,000 + 5,000 + 8
4 0
3 years ago
How do you write 11/ 4 as a percentage?
Ivan
The answer is %225 <span>First, we must convert the given fraction into a decimal number. So use a calculator or long division to convert the given fraction to a decimal number. In this case, 


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6 0
3 years ago
Mackenzie has $70 in a savings account. The interest rate is 5%, compounded annually.
sladkih [1.3K]

Answer:

She will have $73.5 in 1 year

Step-by-step explanation:

She has $70 and the interest rate is 5% so we need to add 5% to the initial value

x = $70 + $70 * 5%

5% = 5/100

x = $70 + $70 * 5/100

x = $70 + $3.5

x = $73.5

She will have $73.5 in 1 year

8 0
2 years ago
Find the measure of the indicated angle to the nearest degree
Alisiya [41]

Answer:

The answer to your question is below

Step-by-step explanation:

14) sin Ф = 32/33

    sin Ф = 0.9697

        Ф = 75.86°

15) sin Ф = 16/36

     sin Ф = 0.444

          Ф = 26.39°

16) sin Ф = 29/36

     sin Ф = 0.806

          Ф = 53.66°

17) cos Ф = 11/34

    cos Ф = 0.324

          Ф = 71.12°

18) sin Ф = 21/40

     sin Ф = 0.525

           Ф = 31.67°

19) cos Ф = 6/14

     cos Ф = 0.429

          Ф = 64.62°

20) cos Ф = 38/39

      cos Ф = 0.974

            Ф = 13°

3 0
3 years ago
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