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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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3 years ago

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Y_Kistochka [10]

Answer:

The coordinates of D is (-4,-9)

Step-by-step explanation:

Given

C = (2,7)

M=(-1,-1) ----- Missing part of question

Required

Determine the coordinates of D

Let the coordinates of D be (x₂,y₂)

We'll solve this question using mid point formula;

$M(x,y) = (\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})$

Where

$C(x_1,y_1) = (2,7)$ and $M(x,y) = (-1,-1)$

Put these values in the formula

$(-1,-1) = (\frac{2+x_2}{2},\frac{7+y_2}{2})$

By comparison;

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$-1 = \frac{2+x_2}{2}$

Multiply both sides by 2

$-2 = 2 + x_2$

Subtract 2 from both sides

$-2 -2 = x_2$

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$-1 = \frac{7+y_2}{2}$

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Subtract 7 from both sides

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Hence, the coordinates of D is (-4,-9)

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