2 years ago

Answer this question (x −2)(x + 5) = 18

Mathematics

1 answer:

DENIUS [597]2 years ago

4 0

Answer:

x=-7 x=4

Step-by-step explanation:

(x −2)(x + 5) = 18

Foil

x^2 +5x-2x-10 = 18

Combine like terms

x^2 +3x -10 =18

Subtract 18 from each side

x^2 +3x -28 = 0

Factor

What two numbers multiply to -28 and add to 3: 7 and -4

(x+7) (x-4) =0

Using the zero product property

x+7=0 x-4 =0

x=-7 x=4

You might be interested in

Ali finished his history assignment in 1/4

Juli2301 [7.4K]

$\frac{1}{4} \times 3 = \frac{3}{12} \frac{2}{3} \times 4 = \frac{8}{12} \\ \frac{3}{12} + \frac{8}{12} = \frac{11}{12}$

5 0

3 years ago

A reporter announces that there is an 80% chance of a thunderstorm tomorrow, and if the thunderstorm materializes, there is a 14

Vinil7 [7]

Answer & Step-by-step explanation:

We will only get a tornado if there is already a thunderstorm materializing

0.80 * 0.14 = 0.112

Probability of a tornado = 11.2%

There is a 100 - 14 = 86% chance of a tornado not being produced.

0.80 * 0.86 = 0.688

Probability of a storm and no tornado = 68.8%

8 0

2 years ago

The population of a local species of dragonfly can be found using an infinite geometric series where a1 = 30 and the common rati

Alchen [17]

The sum will be:

sigma(i = 1 to infinity, 30*(2/5)^i)

-> $\lim_{i \to \infty} \frac{30(1- \frac{2}{5}^{i} )}{ \frac{3}{5} }$

Which is equal to 30/(3/5) = 50

3 0

2 years ago

Read 2 more answers

Consider triangle ABC.

shusha [124]

Give me a second to get the answer and I’ll text you back

8 0

2 years ago

Read 2 more answers

And please explain it?

Brums [2.3K]

You probably jsut need to use law of cosines in order to solve for angle A

$c^2 = a^2+b^2 -2ab \cos C$
or
$a^2 = c^2+b^2 -2cb \cos A$

4 0

3 years ago