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3 years ago

2x^2+8x=x-3x^2 I will mark brainiest

Mathematics

2 answers:

Elden [556K]3 years ago

6 0

Answer:

x=0,x=-1.4

Step-by-step explanation:

$2 {x}^{2} + 8x - x + 3 {x}^{2} = 0 \\ 5 {x}^{2} + 7x = 0 \\ x(5x + 7) = 0 \\ x = 0 \\ \\ 5x + 7 = 0 \\ x = - \frac{7}{5} = -\frac{140}{100} = -1.4$

vesna_86 [32]3 years ago

3 0

Answer:

(0,-7/5)

Step-by-step explanation:

2x^2+8x=x-3x^2

2x^2+3x^2=x-8x

5x^2=-7x

5x^2+7x=0

x(5x+7)=0

x=0 or x=-7/5

solution set is (0,-7/5)

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Plzzz help me with this I’ll give brainliest

scoray [572]

Answer18:

The quadrilateral ABCD is not a parallelogram

Answer19:

The quadrilateral ABCD is a parallelogram

Step-by-step explanation:

For question 18:

Given that vertices of a quadrilateral are A(-4,-1), B(-4,6), C(2,6) and D(2,-4)

The slope of a line is given m= $\frac{Y2-Y1}{X2-X1}$

Now,

The slope of a line AB:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{6-(-1)}{(-4)-(-4)}$

m= $\frac{7}{0}$

The slope is 90 degree

The slope of a line BC:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{6-6}{(-4)-(-1)}$

m= $\frac{0}{(-3)}$

The slope is zero degree

The slope of a line CD:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{(-4)-6}{2-2}$

m= $\frac{-10}{0}$

The slope is 90 degree

The slope of a line DA:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{(-1)-(-4)}{(-4)-(2)}$

m= $\frac{3}{-6}$

m= $\frac{-1}{2}$

The slope of the only line AB and CD are the same.

Thus, The quadrilateral ABCD is not a parallelogram

For question 19:

Given that vertices of a quadrilateral are A(-2,3), B(3,2), C(2,-1) and D(-3,0)

The slope of a line is given m= $\frac{Y2-Y1}{X2-X1}$

Now,

The slope of a line AB:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{2-3}{3-(-2)}$

m= $\frac{-1}{5}$

The slope of a line BC:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{(-1)-2}{2-3}$

m= $\frac{-3}{-1}$

m=3

The slope of a line CD:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{0-(-1)}{(-3)-2}$

m= $\frac{-1}{5}$

The slope of a line DA:

m= $\frac{Y2-Y1}{X2-X1}$

m= $\frac{3-0}{(-2)-(-3)}$

m=3

The slope of the line AB and CD are the same

The slope of the line BC and DA are the same

Thus, The quadrilateral ABCD is a parallelogram

3 0

4 years ago

Y is directly proportional to x when y=30, x=6

rosijanka [135]

Answer:

a) y = 5x

b) y = 60

Step-by-step explanation:

Since, y is directly proportional to x when y=30, x=6

$\therefore \: y \: \alpha \: \: x \\ \therefore \: y = kx ...(1) \\ plug \: y = 30 \: and \: x = 6 \: in \: eq \: (1)\\ 30 = k \times 6 \\ k = \frac{30}{6} \\ k = 5 \\ plug \: k = 5 \: in \: (1) \\ y = 5x....(2) \: (required \: equation) \\ plug \: x = 12 \: in \: eq \: (2) \\ y = 5 \times 12 \\ \huge \red{ \boxed{y = 60}}$

4 0

3 years ago

1. Decide if each su a. 4+3

evablogger [386]

Answer:

the sum is 7

Step-by-step explanation:

ik this because i used to be in kindergarten.

4 0

3 years ago

Help me out plz it’s due rn

MatroZZZ [7]

Answer:

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

Simplify the expressions:

mestny [16]

Answer:

-1v

0.6y+2.1

3w-p+4

1-6x

-5x+10y+z-25

Step-by-step explanation:

Combine like terms

8 0

3 years ago