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Ainat [17]
3 years ago
13

What are the x-intercepts of y=x^2+2x-15

Mathematics
1 answer:
Sedbober [7]3 years ago
8 0

Answer:

(-5,0) and (3,0)

Step-by-step explanation:

Think about it.

What two numbers multiply to -15 and add up to 2?

The answers are 5 and -3.

So plug that into the factored form of a parabola.

y=(x+5)(x-3)

To find the x-intercepts, plug in 0 for y.

(x+5)(x-3)=0

Since we are multiplying, at least one of the terms has to equal 0.

x+5=0 \\ x-3=0 \\ \\ x=-5,3

So the x-intercepts are (-5,0) and (3,0).

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julio bisects angle PQR and labels a point on the bisector as S. He measures angle PQS with a protractor. The measure of angle P
Paha777 [63]

Answer:

The measure of angle PQR is 74 degrees

Step-by-step explanation:

* <em>Lets explain how to solve the problem</em>

- Bisect an angle means divide the angle into two equal parts in

  measures

- Ex: If angle ABC is bisected by a ray BD then:

- Angle ABC is divided into two equal parts in measure

 m∠ABD = m∠CBD and

 m∠ABC = m∠ABD + m∠CBD

- So we can say measure of angle ABC is twice measure of angle

 ABD or twice measure of angle CBD

*<em> Lets solve the problem</em>

- Julio bisects angle PQR and labels a point on the bisector as S

∴ m∠PQS = m∠RQS

∴ m∠PQR = m∠PQS + m∠RQS

∴ m∠PQR = 2 m∠PQS ⇒ (or 2 m∠RQS)

- He measures angle PQS with a protractor and find its measure is

  37 degrees

∵ m∠PQS = 37°

∴ m∠PQR = 2 × m∠PQS

∴ m∠PQR = 2 × 37 = 74°

∴ The measure of angle PQR is 74 degrees

8 0
3 years ago
A jar contains 133. A bigger jar contains 1 2/7 times as many pennies.what is the value of the pennies in the bigger jar
adoni [48]
A jar contains 133 pennies....a bigger jar contains 1 2/7 times as much


so the bigger jar contains :
1 2/7 * 133
9/7 * 133 =
1197/7 =
171 pennies <===
4 0
3 years ago
Which of the following is a unit rate?
ruslelena [56]
The answer is math+math=math
3 0
3 years ago
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The lengths of two sides of a triangle are 3 feet and 5 feet. Which could be the length of the third side?
aivan3 [116]

Answer:

b) 8 feet

Step-by-step explanation:

5+3=8

So, the answer will be 8

6 0
3 years ago
What is the value of |−44|?
yan [13]
Absolute value is simply the distance from zero on a number line. -44 is 44 away from zero, so the absolute value of -44 is

44
8 0
3 years ago
Read 2 more answers
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