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mars1129 [50]
2 years ago
14

Find the sum of 3x² + 5x - 1 and x² - 2x -7​​

Mathematics
2 answers:
vova2212 [387]2 years ago
8 0

Answer:

4x^2+3x-8

Step-by-step explanation:

gizmo_the_mogwai [7]2 years ago
7 0

<h3>{3x}^{2}  + 5x - 1 +  {x}^{2}  - 2x - 7 \\  {3x}^{2}  +  {x}^{2}  + 5x - 2x - 1 - 7 \\  {4x}^{2}  + 3x - 8</h3>
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The equation of three lines are given below
kotykmax [81]

Answer:

The line 2 and Line 3 are perpendicular to each others

But There is no relation between Line 1 and Line 2  , Line 1 and Line 3

Step-by-step explanation:

Given as :

The three line equation is

Line 1 : 2 y = 5 x + 6

Line 2 : y = \frac{2}{5} x - 1

Line 3 : 10 x + 4 y = - 6

Now, The standard equation of line is

y = m x + c

where m is the slope of line

And c is the y intercept

So, From Line 1

2 y = 5 x + 6

or , y =  \frac{5}{2} x + \frac{6}{2}

I.e y =  \frac{5}{2} x + 3

So,  slope of this line = m_1 =  \frac{5}{2}

Again , From Line 2

y = \frac{2}{5} x - 1

So, slope of this line =  m_2 =  \frac{2}{5}

Similarly , From Line 3

10 x + 4 y = - 6

I.e 4 y = - 6 - 10 x

or, y = - \frac{6}{4} -  \frac{10}{4} x

I.e y =  - \frac{5}{2} x  - \frac{6}{4}

So, Slope of this line = m_3 = - \frac{5}{2}

<u>Now, If the lines are parallel , then the slope of the lines are equal</u>

<u>And  If the lines are perpendicular , then the product of the slopes of the lines = - 1</u>

Now, From given lines

m_2 × m_3 = \frac{2}{5} × ( - \frac{5}{2} )

I.e m_2 × m_3 = - 1

So, The line 2 and Line 3 are perpendicular to each others

But There is no relation between Line 1 and Line 2  , Line 1 and Line 3

Hence The line 2 and Line 3 are perpendicular to each others

But There is no relation between Line 1 and Line 2  , Line 1 and Line 3 Answer

6 0
4 years ago
3(2x+6) = 2(4x-5)<br><br> plshelp
umka21 [38]

Answer:

x = 14

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

Step 2: Subtract 8x from both sides.

Step 3: Subtract 18 from both sides.

Step 4: Divide both sides by -2.

7 0
3 years ago
Read 2 more answers
HELPPPPPP
dimaraw [331]
32, i believe is the answer

5 0
3 years ago
3(m - 4) &lt; 27
Free_Kalibri [48]

Step-by-step explanation:

This is right m does equal 13. D first you multiply everything in the para thesis and so on

6 0
3 years ago
Help Question! Due Today
Anastasy [175]
5.B

what is 6

7. It’s equal, should be c
3 0
3 years ago
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