3 years ago

Factor 7x² – 31x – 20.

Mathematics

2 answers:

atroni [7]3 years ago

7 0

There are two answers one is x=-4/7=-0.571 or this second one is x=5.

wariber [46]3 years ago

4 0

<span>7x² – 31x – 20 = </span>(x - 5)(7x + 4)

You might be interested in

There are 9 students at the Math Club picnic . If 5 students are drinking punch and 4 are drinking lemonade , what fraction are

Hunter-Best [27]

lol 5/9 because 5 out of the 9 are drinking punch, the other 4 are drinking lemonade.

8 0

3 years ago

Read 2 more answers

2. A circle has a diameter of 12 m. Find the circumference. Use 3.14 for π. DO NOT WRITE THE UNITS IN YOUR ANSWER

guajiro [1.7K]

Answer:

37.68

Step-by-step explanation:

12*3.14

4 0

2 years ago

Read 2 more answers

F(x) = 1?-1.9(x) = x - 2. Find<br> (a) ( + g)(3)

ValentinkaMS [17]

Answer: f(x)=1-1.9x=x-2

Step-by-step explanation:

Big brain time.

4 0

3 years ago

Jeff wants to know how many miles it is from his house to school. On a map the distance is 3 inches. If the scale is 1/2 inch fo

frez [133]

Answer:

12 miles

Step-by-step explanation:

1/2 inch per 2 miles

3 inches away

3 ÷ 1/2 = 6

6 * 2 = 12

8 0

3 years ago

Prove that sinxtanx=1/cosx - cosx

maks197457 [2]

Answer:

See below

Step-by-step explanation:

We want to prove that

$\sin(x)\tan(x) = \dfrac{1}{\cos(x)} - \cos(x), \forall x \in\mathbb{R}$

Taking the RHS, note

$\dfrac{1}{\cos(x)} - \cos(x) = \dfrac{1}{\cos(x)} - \dfrac{\cos(x) \cos(x)}{\cos(x)} = \dfrac{1-\cos^2(x)}{\cos(x)}$

Remember that

$\sin^2(x) + \cos^2(x) =1 \implies 1- \cos^2(x) =\sin^2(x)$

Therefore,

$\dfrac{1-\cos^2(x)}{\cos(x)} = \dfrac{\sin^2(x)}{\cos(x)} = \dfrac{\sin(x)\sin(x)}{\cos(x)}$

Once

$\dfrac{\sin(x)}{\cos(x)} = \tan(x)$

Then,

$\dfrac{\sin(x)\sin(x)}{\cos(x)} = \sin(x)\tan(x)$

Hence, it is proved

5 0

2 years ago