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2 years ago

Help me pleaseeeeeeREEEEEEEEE

Mathematics

1 answer:

lions [1.4K]2 years ago

7 0

First answer: x = 3

How?

3x - 7 = 2

3x = 2 + 7

3x = 9

x = 9/3

x = 3

Second Answer:= x=5

How?

3 + 2x - (x + 1) = 3x - 6

-3x + 2x - x = -6 - 3 - 1

-2x = -10

x = 5

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Alexxandr [17]

Answer:

$x=\frac{-7-\sqrt{17}}{2}\textrm{ or }x=\frac{-7+\sqrt{17}}{2}$

Step-by-step explanation:

Given:

The equation is given as:

$x^2=-7x-8$

Rearrange the above equation in standard quadratic equation of the form $ax^2+bx+c=0$

Adding $7x + 8$ on both sides, we get

$x^2+7x+8=0$

Here, $a=1,b=7,c=8$

Now, we solve this using quadratic formula,

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\x=\frac{-7\pm \sqrt{7^2-4(1)(8)}}{2(1)}\\x=\frac{-7\pm \sqrt{49-32}}{2}\\x=\frac{-7\pm \sqrt{17}}{2}\\\\\\\therefore x=\frac{-7-\sqrt{17}}{2}\textrm{ or }x=\frac{-7+\sqrt{17}}{2}$

7 0

3 years ago

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I need help with this question please

jolli1 [7]

Answer: it C

Step-by-step explanation: if it not incorrect sorry for the wrong answer

6 0

2 years ago

Evaluate the polynomial for the given value of x: f(x) =3x^3+5x^2+x-2 when x=2

sasho [114]

Answer: $f(2)=44$

Step-by-step explanation:

Given the polynomial $f(x) =3x^3+5x^2+x-2$ , you can evaluate it for the given value of the variable "x" by substituting the value $x=2$ into the polynomial.

Therefore, when $x=2$ , you get the following result:

$f(x) =3x^3+5x^2+x-2 \\\\f(2) =3(2)^3+5(2)^2+(2)-2\\\\f(2)=3(8)+5(4)+2-2\\\\f(2)=24+20\\\\f(2)=44$

3 0

2 years ago

A rectangle pool is 7 ft wide, it is 3 times as long as it is wide what’s the dimensions of the pool?

svetoff [14.1K]

The length is 3 times longer than the width (7)

3 x 7 = 21

the length is 21.

To find perimeter, add all sides together:

21 + 21 + 7 + 7 = 42 + 14 = 56

56 ft is your answer

hope this helps

3 0

3 years ago

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What is the area of the regular trapezoid below? - 6 cm T 8 cm 10 cm

Elenna [48]

Answer:

Area = 64 cm²

Step-by-step explanation:

To find the area, we have to follow some steps:

=> Step 1: Make the bases similar:

Since we have 2 bases given 6 and 10 we have to come up with a third base by finding their average:

(6 + 10) / 2

(16) / 2

So now that we know our base,

=> Our second step is to multiply the base we found by the height of the trapezoid:

Area = common base * height

Area = 8 * 8

Area = 64 cm²

Hope this helps!

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2 years ago