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geniusboy [140]
3 years ago
6

PLEASE HELP REALLY FAST PLS I BEG

Mathematics
1 answer:
Lerok [7]3 years ago
3 0

Answer:

I can't see the problem clearly

Step-by-step explanation:

but r.i.p Chadwick Boseman

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The equation 12x² + 4kx + 3 = 0 has real and equal roots, if
sleet_krkn [62]

Answer:

k=\pm3

Step-by-step explanation:

[...] if you can write the LHS as a perfect square, or if you can't spot a factorization of it right away, if and only if the discriminant \Delta = b^2-4ac (or, if b is an even number, 1/4 of it) is zero.

<u>I see it! I see it!</u>

Stare at it for a while. First term is 3(2x)^2, third term is 3(1)^2, we are missing a double product, but we can play with k. For the LHS to be 3(2x\pm1)^2 = 3(4x^2\pm4x+1) = 12x^2\pm12x+3 you just need 4k= \pm12 \rightarrow k=\pm3.

<u>I don't see it...</u>

Then number crunching it is. Set the discriminant to 0, solve for k

\frac{\Delta}4 = 4k^2-12\cdot 3 =0 \rightarrow 4k^2=36 \\k^2 = 9 \rightarrow k=\pm3

8 0
2 years ago
Are carpet coast $15 per square metre. The total delivery charge is $21 Peter buys N squared metres of carpet what is the expres
postnew [5]

Answer:

15N + 21

Step-by-step explanation:

We are given that,

Amount of carpet bought by Peter = N meter²

The cost per meter square of the carpet = $15

So, the cost of 'N' meter square of carpet = 15N dollars.

Also, the delivery charge for the carpet = $21

Thus, the total cost of the carpet is given by,

Total cost = Cost per square meter + Delivery charge

i.e. Total cost = 15N + 21 (in dollars).

Hence, the expression representing the cost in dollars is '15N + 21'.

8 0
2 years ago
Point A, located at (-5, 1) is translated. Point A' is located at (6, 1). What was the translation?
earnstyle [38]

Answer:

11 units right

Step-by-step explanation:

11 units right

from A (-5, 1) to   A' (6, 1)

(-5 + 11, 1 ) = (6, 1)

4 0
2 years ago
Read 2 more answers
A rock is thrown into the air. The height of the rock is modeled by s(t) = −16tଶ + 64t + 80 feet for t ≥ 0 seconds. The rock hit
ExtremeBDS [4]

Answer:

144 feets

Step-by-step explanation:

Look on s(t) like quadratic function. We need to find maximum of the function using 1st diferetioal:

s(t)=-16t^2+64t+80

s’(t)=-32t+64

S’(t)=0 if t=2

For t>2, s’(t)<0

For t<2, s’(t)>0. So the maximum od function is in the point 2.

S(2)=-16*4+64*2+80=-64+128+80=144

6 0
2 years ago
I need some help plz ​
riadik2000 [5.3K]

Answer:

x = 7

Step-by-step explanation:

*set equations = to each other since they're corresponding angles which are equal to each other*

15x - 5 = 13x + 9 --> *subtract 13x from both sides*

2x - 5 = 9 --> *add 5 to both sides*

2x = 14 *divde by 2 on both sides*

x = 7

check:

15 (7) - 5 = 13 (7) + 9

105 - 5 = 91 + 9

100 = 100

5 0
3 years ago
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