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4 years ago

What is the solution of the following quadratic inequality? x2 – 4x – 21 ≤ 0

Mathematics

2 answers:

Dominik [7]4 years ago

7 0

Answer:

3, and -7

Step-by-step explanation:

First factor the trinomial

y=x2−4x−21

Find 2 numbers knowing sum (-4) and product (c = - 21). They are the numbers in the factor pair (3, -7).

y = (x + 3)(x - 7)

Solving the 2 binomials, we get:

x = -3 and x = 7

trasher [3.6K]4 years ago

6 0

Answer: Its B

A number line going from negative 8 to 8. Closed circles are at negative 3 and 7. The line between the circles is shaded.

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A triangle with area 45 square inches has a height that is two less than four times the width. Find the width and height of the

PilotLPTM [1.2K]

Answer:

Step-by-step explanation:

45 = (b(4b - 2))/2

90 = 4b2 - 2b

4b2 - 2b - 90 = 0

(2b + 9)(2b - 10) = 0

2b + 9 = 0

2b = -9

b = -9/2

If we were looking for zeroes, this would be an answer, but since we're looking for measurement, we don't use negative numbers.

90 = 4b2 - 2b

4b2 - 2b - 90 = 0

(2b + 9)(2b - 10) = 0

2b + 9 = 0

2b = -9

b = -9/2

7 0

3 years ago

Read 2 more answers

Need help solving this !

Zigmanuir [339]

Answer:

Step-by-step explanation:

To start of u have to subtract 150 with 180 which is 180 (cuz its a straight line and E to get angle S

Now that we know that 180-150= 30

We add S and R then subtract by 180

so 80+ 30= 110

then we said subtract 180

180-110= 70

Now we know that angle Q is 7-

Then the bottom is RS & SE (NOT REALLY SURE)

It is a Remote Interior Angle

IF RIGHT PLZ GIVE BRAINLIEST

THANK U

HAVE A GREAT DAY AND BE SAFE :)

4 0

3 years ago

<img src="https://tex.z-dn.net/?f=%5Chuge%5Ccolor%7Byellow%7D%5Cunderline%20%5Ccolorbox%7Bviolet%7D%20%7B%5Ccolor%7Bred%7D%7BQUE

Paladinen [302]

Answer:

FALSE
TRUE
TRUE

Step-by-step explanation:

1.

Non-standard units can be used to measure volume
Examples : m³, in³, cm³, mm³, L

2.

The volume of a rectangular prism can be found by multiplying the length, width, and height
V = lwh

3.

If there are smaller units, then naturally more of the units will be used
If there are larger units, then less of the units will be used

8 0

2 years ago

On a map, 1 in. represents 12 mi. Two cities are 6 1/2in. apart on the map.

olasank [31]

1 inch = 12 miles

so 6 1/2 inches (or 6.5 inches) = 6.5 * 12 = 78 miles <===

7 0

4 years ago

Read 2 more answers

Write a point slope equation

Over [174]

point slope equation formula: y - y1 = m (x - x1)

(-1,4) (-2,1)

answer:

1 -4 = 3 (-2+1)

4 0

2 years ago