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SSSSS [86.1K]
3 years ago
6

Looking for some head pls help

Mathematics
1 answer:
Kipish [7]3 years ago
4 0

Answer:Bet bro how you want it


Step-by-step explanation: sloppy or clean?


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Solve the equations by factoring:<br><br>x^2−3x−40=0<br><br>4x^2−81=0
Alja [10]

Answer:

see explanation

Step-by-step explanation:

Given

x² - 3x - 40 = 0

Consider the factors of the constant term (- 40) which sum to give the coefficient of the x- term (- 3)

The factors are - 8 and + 5, since

- 8 × 5 = - 40 and - 8 + 5 = - 3, thus

(x - 8)(x + 5) = 0 ← in factored form

Equate each factor to zero and solve for x

x - 8 = 0 ⇒ x = 8

x + 5 = 0 ⇒ x = 5

------------------------------------------------------

Given

4x² - 81 = 0 ← this is a difference of squares and factors in general as

a² - b² = (a + b)(a - b), thus

4x² - 81

=(2x)² - 9²

= (2x + 9)(2x - 9) = 0 ← in factored form

Equate each factor to zero and solve for x

2x + 9 = 0 ⇒ 2x = - 9 ⇒ x = - \frac{9}{2}

2x - 9 = 0 ⇒ 2x = 9 ⇒ x = \frac{9}{2}

8 0
3 years ago
Read 2 more answers
Which expression is equivalent to √-80?<br> 4√5<br> -4√5<br> -4i √ 5<br> 4i √ 5
miskamm [114]

Answer:

  4i√5

Step-by-step explanation:

\sqrt{-80}=\sqrt{(-1)(16)(5)}=\sqrt{-1}\cdot\sqrt{16}\cdot\sqrt{5}=4i\sqrt{5}

6 0
3 years ago
Pentagon VWXYZ is shown on the coordinate grid. A student reflected pentagon VWXYZ across the x-axis to create pentagon V’W’X’Y’
pav-90 [236]

Reflecting across the x axis maintains the same x coordinate, but changes the sign of the y coordinate.

So, the transformation is

(x,y)\mapsto (x,-y)

7 0
3 years ago
Can you solve it. Pls pls
prisoha [69]

Answer:

C

Step-by-step explanation:

Don't know how to explain..

5 0
3 years ago
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20 POINTS!! Please help asap ive reposted this 3 times and i only have a little time left! thank you so much! please answer all
Evgen [1.6K]

Answer: 5. AE

               6. 6cm

               7. 20 in

                8. Angle DCF

Step-by-step explanation:

3 0
3 years ago
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