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3 years ago

Solve by factorisation 10r^2 - 23r + 9 = 0 Please answer fast

Mathematics

1 answer:

Ede4ka [16]3 years ago

3 0

Answer:

9/5 or 1/2

Step-by-step explanation:

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11111nata11111 [884]

Answer:

Step-by-step explanation:

From 3 1/2 (= 7/2) to 6 cups of flour (basically 6 divided by 7/2) is 12/7

now you multiply 3/4 times 12/7

it equals to 36/28

simplify each by 4

36/4 = 9 and 28/4 = 7

9/7

as a mixed number it is 1 2/7

6 0

3 years ago

When 15 minus 3 is multiplied by a number the product is 2.

AlexFokin [52]

The number is 1/6. 15 minus 3 = 12. 12 times 1/6 is 2

4 0

3 years ago

Write down the quadratic equation whose roots are $x = -7$ and $x = 1,$ and the coefficient of $x^2$ is 1. Enter your answer in

pav-90 [236]

<h2>Steps:</h2>

So firstly, since we know that the coefficient of x² is 1, this means that this is our base equation:

y = x² + bx + c

Now, since we know that the roots are -7 and 1, set y = 0 and set x = -7 and 1 and simplify:

$0=(-7)^2+b(-7)+c\\0=49-7b+c\\-49=-7b+c\\\\0=1^2+b(1)+c\\0=1+b+c\\-1=b+c\\\\-49=-7b+c\\-1=b+c$

Now with this, we can set up a system of equations to solve for b and c. For this, I will be using the elimination method. For this, subtract the 2 equations:

$\begin{alignedat}{2}-49&=-7b+c\\-(-1&=b+c)\\-48&=-8b\end{alignedat}$

Now that the c variable has been eliminated we can solve for b. For this, divide both sides by -8 and your first part of your answer is b = 6.

Now that we know the value of b, plug it into either equation to solve for c:

$-49=-7(6)+c\\-49=-42+c\\-7=c\\\\-1=6+c\\-7=c$

<h2>Answer:</h2>

<u>Putting it together, your final answer is x² + 6x - 7 = 0.</u>

4 0

3 years ago

Mrs.johnson is working on math with a group of students. she has a total of 15 students. 9 of them are girls. what is the ratio

Gnoma [55]

Answer:

Step-by-step explanation:

the rest are boys

7 0

3 years ago

Use an area model to solve. 1 3/4 X 2 1/2

Sauron [17]

I can give you the answer right of the top of my head here it is 1 and 3/4 x 2 and 1/2 is 4 and 3/8

4 0

3 years ago