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2 years ago

Solve the following quadratic equation by rearranging and then factorising x^2 + 7x + 19 = 9

Mathematics

2 answers:

IRISSAK [1]2 years ago

6 0

Answer:

x = -5 & x = -2

Step-by-step explanation:

x^2 + 7x +10 = 0 you takeaway 9 as quadratic equations have to equal 0

(x+5)(x+2) = 0 you find 2 numbers that go into 10 that add to make 7 and multiply to make 10

(x+5) = 0 so x =-5 & (x+2) = 0 so x =-2

wolverine [178]2 years ago

5 0

Answer:

your lucky you did have a online lessons earlll

Step-by-step explanation:

The following are the temperatures in °C for the first 14 days of January:

-6, -2.5, 2, 2.5, -0.5, 5, 10, -3, -7, 3, -1, 7, 1, 4.5

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Answer:

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Step-by-step explanation:

Step 1: Simplify both sides of the equation.

−3x−32=−2(5−4x)

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2 years ago

What is the rate of change for both of these tables. 25 pts

Rudiy27

Answer:

For the table on the left the rate of change is $22.8$

For the table on the left the rate of change is $-2$

Step-by-step explanation:

The range of change is the slope. The slope can be found with the following formula:

$m=\frac{y_2-y_1}{x_2-x_1}$

<u>For the table on the left</u>

Choose two points. In this case you can choose (-1,-24), (4,90)

You can say that:

$y_2=-24\\y_1=90\\\\x_2=-1\\x_1=4$

Substituting these values into the formula, you get:

$m=\frac{-24-90}{-1-4}\\\\m=22.8$

<u>For the table on the right</u>

Choose two points. You can choose (3,-6), (-6,12)

You can identify that:

$y_2=-6\\y_1=12\\\\x_2=3\\x_1=-6$

Substituting these values into the formula, you get:

$m=\frac{-6-12}{3-(-6)}\\\\m=-2$

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