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strojnjashka [21]
3 years ago
5

Use the quadratic formula to find the roots of y = x2 + 5x + 6 :

Mathematics
2 answers:
Katena32 [7]3 years ago
7 0

Answer: x = -2 and x = -3

Step-by-step explanation:

y = x^2 + 5x + 6 *FACTOR*

(x+2) (x+3) = 0

x + 2 = 0

  -2     -2

x = -2

x + 3 = 0

    -3   -3

x = -3

Angelina_Jolie [31]3 years ago
3 0
The answer is x = -2 and x = -3
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the sum of three numbers is 79. The second number is 5 times the first, while the third is 16 more than the first. Find the Numb
faust18 [17]
Let the 1st number be x; 2nd number be y; 3rd number be z.

x + y + z = 79

x = number we are looking for.
y = x * 5 ==> 5 times the first
z = x + 16 ==> 16 more than the first

Therefor,

x + (x * 5) + (x+16) = 79

1st step, multiply the 2nd number: x * 5 = 5x

x + 5x + x + 16 = 79

Add all like numbers:

7x + 16 = 79

To get x, transfer 16 to the other side and change its sign from positive to negative.

7x = 79 - 16
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To get x, divide both sides by 7

7x/7 = 63/7
x = 9

To check. Substitute x by 9.

x + (x * 5) + (x+16) = 79

9 + (9 * 5) + (9 + 16) = 79
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79 = 79 equal. value of x is correct.

4 0
3 years ago
Read 2 more answers
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Alexxx [7]

Answer:

c. (x +3)(x + 1)

Step-by-step explanation:

Factoring an equation is a way of expressing an equation as the product of other linear expressions. The following expression,

x^2 +4x +3

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(x+3)(x+1)

To check this, one can distribute, one of the expressions over the other, then simplify, the result should be the starting expression,

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Distribute,

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Simplify,

x^2 +x +3x + 3\\

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3 years ago
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