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2 years ago

Solve by factorising x2+8x+15=0

Mathematics

2 answers:

Alex_Xolod [135]2 years ago

6 0

Answer:

Hi! The correct answer is x= -3 ,-5!

Step-by-step explanation:

<em>~Factor and set each factor equal to 0~</em>

nlexa [21]2 years ago

6 0

Answer:

(X+2) (X+6)=0

Step-by-step explanation:

X2+8x+12=0

or, X2+(2+6)X+12=0

or, X2+2x+6x+12=0

or, X(X+2) +6(X+2) =0

or, (X+2)(X+6)=0

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X - 3= -21 <br>This is so confusing:(

Aneli [31]

Answer:

$\huge\boxed{x=-18}$

Step-by-step explanation:

In order to solve this, we are trying to find the value of $x$ . Basically, $x$ is a placeholder for a number that is unknown. Some number minus 3 is equal to 21.

Our goal is to find $x$ . To do this we want to isolate $x$ on one side of the equation

$x-3=-21$

Let's add 3 to both sides.

$x-3 + 3 = -21+3\\\\-3 + 3 = 0\\\\x = -21+3\\\\x=-18$

Hope this helped!

6 0

3 years ago

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When shopping for a baby doll for her daughter, Ms. Martin found that the price of four baby dolls was less than $102. Which

Alla [95]

Answer:

Step-by-step explanation:

because it is 4 dolls and x is the amount of dollars 1 doll is and 4x dolls are less then 102, the only answer that makes sense is b

8 0

1 year ago

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!!!! HELP!!! What is the solution to this system of linear equations?

earnstyle [38]

Answer:

(7, 3)

Step-by-step explanation:

get rid of the y by adding:

x=-2

+x=16

then add the equalities:

2x=14

divide by 2:

x=7

then subsitute the x in to find y!

7+3y=16

3y=16-7

3y=9

y=3

3 0

3 years ago

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Please help. i dont understand, so if you could kindly please show me step by step

Artemon [7]

4.7244m

convert feet to inches using 1 foot = 12 inches

15.5 feet = 15.5 × 12 = 186 inches

multiply this by 2.54 to convert to cm

186 inches = 186 × 2.54 = 472.44 cm

now 1m = 100cm

divide 472.44 by 100 to convert to m

472.44 ÷ 100 =4.7244m

6 0

3 years ago

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The midpoint of GH are M(4,3) and D(5,-6). The coordinates of the endpoint are?

Phantasy [73]

Answer:

The endpoint coordinates are (3,12)

Step-by-step explanation: $\frac{5+x^{2} }{2} =4$ $\frac{-6+y^{2} }{2} = 3$

You multiply 4 by 2 which gives you 8 and write the equation $5+x^{2} =8$ then you subtract 5 from 8 to get 3 for the x coordinate.

You multiply 3 by 2 which gives 6 and writhe the equation $-6+y^{2}=6$ then you substitute the -6 for +6 and add +6 and 6 to get 12 for the y coordinate.

To check use the midpoint formula with coordinates D and your endpoint coordinates $\frac{5+3}{2}=\frac{8}{2} =4 \\$ $\frac{-6+12}{2} =\frac{6}{2} =3$ and you get the answer for the midpoint which is (4,3)

6 0

2 years ago