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Maurinko [17]
3 years ago
9

Are these right before I go on I have a 100 in math #wannakeepit

Mathematics
1 answer:
Serjik [45]3 years ago
4 0
They are all correct

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What is the value of the expression 2x2+3xy-y2, when x=2 And y=-4
Otrada [13]
Plug in 2 for x, and -4 for y

2(2)² + 3(2)(-4) - (-4)²

2² = 4(2) = 8
3(2) = 6(-4) = -24
-4² = 16

8 - 24 - 16 = answer

Simplify.

answer = 8 - 40
answer = -32

-32 is your answer

hope this helps
7 0
3 years ago
This is Josh’s work and solution for the equation x^2-6x-7=0:
inn [45]

Answer:

Step-by-step explanation:

the solution is right

x^2-6x-7=0:

x^2-6x-7=0 (add 7 to both sides)

x^2-6x=7

x^2-6x+9=7+9  (the coefficient of x² will be used to divide all sides)for here its 1, it will remain same ,

then we get the coefficient of x, divide it by 2 and square it and add it to both sides

which is like these

x²-6x=7

the coefficient of x is -6

-6/2 = -3, square it (-3)² = 9

then add 9 to both sides

x^2-6x+9=7+9

simplifiy the squares on the left hand side

x²+9 = (x-3)²

(x-3)^2=16

√(x-3)^2 )=±√16

x-3=± 4

x=-3±4

then simplify each sign

x=-3+4            x=-3-4

x=1                   x=-7

7 0
3 years ago
Read 2 more answers
Can someone help me out my grads are bad
svp [43]

Answer:

50 m^2

Step-by-step explanation:

3cm = 5 m

6 cm = 10 m

5 x 10 = 50 m^2

If my answer is incorrect, pls correct me!

If you like my answer and explanation, mark me as brainliest!

-Chetan K

7 0
2 years ago
Read 2 more answers
Can someone plz help me with this I don't get it
frutty [35]
The answer is 26

Explanation:
It’s easy
7 0
2 years ago
HELLPPPP ANSWERRR AND EXPLAIN!!!!!​
bixtya [17]

Answer:

No

Step-by-step explanation:

This is because K and B don't share the same angle measurement. They both will be different numbers that must equal 180 degrees. With that K will be corresponding with J while B will be corresponding with D.

Hope this Helped

5 0
3 years ago
Read 2 more answers
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