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jeyben [28]
3 years ago
15

Please help!! More pages after this one

Mathematics
1 answer:
Mademuasel [1]3 years ago
3 0
1) Since x = -4 and x = -6 are zeros, then, by definition, (x + 4) and (x + 6) are factors of the polynomial. Another way in understanding this is that when x = -4, there would be no remainders.

Thus, we can simply write it as: P(x) = (x + 4)(x + 6) = x² + 10x + 24 (ie C)

2) Using the discriminant, we can find whether a quadratic has two, one, or no roots at all. Symbolised as delta (Δ), the discriminant formula goes as follows:

Δ = b² - 4ac
Thus, if we move the 3 to the other side, we get:
Δ = (-5)² - 4(3)(-10) > 0
Since Δ > 0, then there lies two solutions.

To find rationality or irrationality, we need to check whether or not the square root of the discriminant is an integer or not. If the square root of the discriminant is not an integer, we have irrational roots.

Thus, we've worked out that the discriminant is 145. But 145 is not a perfect square, so when we take the square root of it, we get irrational roots.
Hence, we have two irrational roots.

3) Since we have a fraction, we know that the denominator cannot be zero. Thus, to find places where undefined x-values occur, we need to let the denominator equal to zero:

x² - 16 = 0
x² = 16
x = 4 and -4

These are the restricted values for x, since x cannot equal to 4, or -4.
Hence, your answer is x = 4, -4

4) We can expand and move everything to the LHS.
2(x + 2)² - 32 = 0
2(x² + 4x + 4) - 32 = 0
2x² + 8x + 8 - 32 = 0
2x² + 8x - 24 = 0

We can factorise 2 outside.
2(x² + 4x - 12) = 0

x² + 4x - 12 = 0

We can factorise this further.
(x + 6)(x - 2) = 0

x = -6, 2 are our solutions.
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2x - 5y + 3z 5x + 9y - 2z
SIZIF [17.4K]

Answer:

3xz5+2x+4y−2z

Step-by-step explanation:

2x−5y+3z5x+9y−2z

=2x+−5y+3xz5+9y+−2z

Combine Like Terms:

=2x+−5y+3xz5+9y+−2z

=(3xz5)+(2x)+(−5y+9y)+(−2z)

=3xz5+2x+4y+−2z

7 0
3 years ago
What is the solution to the equation 5x = 40?
Dima020 [189]
To find X, we can divide 5 into 40.
40 divided by 5 is 8.
Now we can do 5 x 8. That is 40.

X=40

OR we can do it another way.
40 divided by 5 is 8.
Cross out 5 divided by 5.

Now we have 8. Still.
X is 8
7 0
2 years ago
Read 2 more answers
Help please!!! I need that answer fast
blagie [28]

Answer:

Step-by-step explanation:

5 0
2 years ago
During a marathon, Jane ran 6 miles. Jessica ran 5.068 miles. How many more miles did Jane run than
Sloan [31]

Answer:

0.932 miles

Step-by-step explanation:

To find out the difference we subtract

6 - 5.068 = 0.932

Add the units (miles)

0.932 miles

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

5 0
2 years ago
Read 2 more answers
Joe has an ice cream stand. last week he spent $85 for ice cream and supplies. he earned $125. what was his profit?
Elodia [21]

Answer:

40 dollars

Step-by-step explanation:

Profit is what he earned minus his costs

Profit = 125 -85

Profit = 40

3 0
2 years ago
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