All categories

2 years ago

Identify the solutions to the quadratic equation. Check all that apply. x2 + 4x - 21 = 0

Mathematics

2 answers:

Vika [28.1K]2 years ago

8 0

Answer:

C and D

Step-by-step explanation:

(X-3)(X+7)=0

X-3=0 X+7=0

X=3 X=-7

soldier1979 [14.2K]2 years ago

5 0

Answer:

6, -7 ; C and D

Step-by-step explanation:

(-4 +/- √16+84)/2=x

(-4 +/- 10)/2=x

x=6/2=3, or x=-14/2= -7

You might be interested in

A purse contains $2.95 in quarters and dimes. The number of quarters exceeds the number of dimes by 2. Find the number of quarte

abruzzese [7]

Answer:

9 quarters and 7 dimes

Step-by-step explanation:

1 quarter = $0.25

1 dime = $0.10

9 (0.25) = $2.25

7 (0.10) = $0.70

2.25 + 0.70 = $2.95

4 0

3 years ago

I WILL GIVE 20 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS AND EXPLAIN WHY THAT IS THE ANSWER

saw5 [17]

Answer:

Step-by-step explanation:

isosceles trapezoid = congruent sides in pairs and the same for the angles

<h2><u><em>angle 1 = 32°</em></u></h2><h2><u><em>angles 2 & 3 = 148°</em></u></h2>

the sum of the interior angles is 360°

so angle 1 = 32°

angles 2 and 3

(360 - 32 - 32) :2 = 148°

check

32 + 32 + 148 + 148 = 360°

the answer is good

7 0

2 years ago

What is the measure of angle y in this figure?<br><br> Enter your answer in the box.<br><br> y=__°

Inga [223]

Answer:

sum of angles at a point is equal to 360

so, 360= 163+ x°+ y°+z°

y°=360-163 -x° - z°

y°=197- x° -z°

7 0

2 years ago

The diagram shows a 3 cm x 5 cm x 4 cm cuboid

Rainbow [258]

Answer:

a) The length of segment AC is approximately 5.83 centimeters.

b) The angle ACD is approximately 34.5º.

Step-by-step explanation:

a) Since $AB \perp BC$ , the length of segment $AC$ is determined by Pythagorean Theorem, that is:

$AC = \sqrt{(5\,cm)^{2}+(3\,cm)^{2}}$

$AC \approx 5.831\,cm$

The length of segment AC is approximately 5.831 centimeters.

b) Since $AB \perp BC \perp AD$ , the length of segment $AD$ is determined by this Pythagorean identity:

$AD = \sqrt{(3\,cm)^{2}+(5\,cm)^{2}+(4\,cm)^{2}}$

$AD \approx 7.071\,cm$

The angle ACD is determined by the following trigonometric expression:

$\cos C = \frac{AC}{CD}$

$\cos C = \frac{5.831\,cm}{7.071\,cm}$

$\cos C = 0.825$

$C = \cos^{-1} 0.825$

$C \approx 34.448^{\circ}$

The angle ACD is approximately 34.448º.

4 0

2 years ago

Which polynomial function has a leading coefficient of3 and roots -4, i, and 2, all with multiplicity 1?

andreyandreev [35.5K]

Answer:

Step-by-step explanation:

f(x) = 3(x + 4)(x – i)(x + i)(x – 2)

7 0

3 years ago