3 years ago

Which equation has the same solution as x^2-6x-13=0?

1 answer:

8 0

$x^2-6x-13=0\\\\\underbrace{x^2-2x\cdot3+3^2}_{use:(a-b)^2=a^2-2ab+b^2}-3^2-13=0\\\\(x-3)^2-9-13=0\\\\(x-3)^2-22=0\\\\\boxed{(x-3)^2=22}$

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X² + 2x - 3 = 0

tankabanditka [31]

Step-by-step explanation:

x²+2x-3=0

(x²+3x)-(x-3)=0

x(x+3)-1(x+3)=0

(x-1)(x+3)=0

x=1 or x=-3

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2 years ago

I have a test and only have an hour please hurry! 90 / 3* (9 +6)=?

Alex777 [14]

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Complete the coordinate proof of the theorem. Given: A B C D is a rectangle. Prove: The diagonals of A B C D are congruent.

Inessa05 [86]

Step-by-step explanation:

Given coordinates of the rectangle ABCD:

A(0, 0), B(a, 0), C(x, y), D(0, b)

Lets first find coordinates of C

We can see that A and B are on same line horizontally, so C and D will be on the parallel line

The distance AB and CD are equal also distance AD and BC are equal, therefore

AB = a - 0 = a, CD = a
AD = b - 0 = b, BC = b

So the coordinates of C are:

x = a, y = b

Now the diagonals:

AC = √(a-0)² + (b-0)² = √a²+b²
BD =√(0-a)² + (b -0)² = √a² + b²

Since AC = BD, we can state they are congruent

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2 years ago

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You decide to bake some cakes. You need 150 g of flour for 12 cakes. How much flour do you need for 30 cakes?

miss Akunina [59]

150g/12cakes
150/12 = 12.5
12.5g/cake
12.5x30 = 375
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3 years ago

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In 4567 which number means ones?

Wittaler [7]

Answer:

7 means ones because it is the units

Step-by-step explanation:

4= thousand

5= hundred

6= tens

7=ones / unit

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2 years ago

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