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dybincka [34]
3 years ago
9

Help please, i really need it​

Mathematics
1 answer:
belka [17]3 years ago
3 0

Answer:

1/2

Step-by-step explanation:

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Which of the following are solutions?
zloy xaker [14]

This is a quadratic equation. There's a shortcut (two shortcuts really) called the Shakespeare Quadratic Formula (2b or -2b) applicable when the middle term is even:

x^2 - 2bx + c \textrm{ has zeros } x= b\pm \sqrt{b^2-c}

ax^2 - 2bx + c \textrm{ has zeros } x= \dfrac 1 a( \left b\pm \sqrt{b^2-ac} \right)

OK, our problem is

9x^2 - 6x -7 = 0

x = \frac 1 9 (3 \pm \sqrt{9-(9)(-7)}) = \frac 1 9(3 \pm \sqrt{72})= \frac 1 9(3 \pm 3 \sqrt{8}) = \frac 1 3(1 \pm \sqrt 8)

Typically we'd write \sqrt 8 = 2 \sqrt 2 but the answers here don't so we won't either.

Answer: C and D

7 0
3 years ago
Twelve members of a band purchase one beverage each during a break at practice. Exactly 5 of the 12 members bought bottled water
Hoochie [10]

Answer:

70

Step-by-step explanation:

You have to use ratios.  If 5 of 12 members bought water, then x of 168 members will buy water.

\frac{5}{12}  = \frac{x}{168}\\12x = 840\\x = 70

70 members will buy bottled water.

8 0
2 years ago
What is the solution to this equation?
Usimov [2.4K]
-0.5 n^2=-18
n^2= 36
n= sqrt (36)=6 or -6

Hope this can help.
7 0
3 years ago
Read 2 more answers
For the given term, find the binomial raised to the power , whose expansion it came from: 10a ^ 3 * b ^ 2 .
9966 [12]

Answer:

i dont know sorry

Step-by-step explanation:

7 0
3 years ago
5x^(-2)-17x^(-1)+6<br> i’m so confused pls help<br> will give brainliest
laila [671]

It's a quadratic equation in disguise. If you let y=x^{-1}, then y^2=x^{-2}, and we can rewrite the equation as

5y^2-17y+6=0

Solve for y however you like; we get y=\dfrac25 and y=3.

But we want to solve for x, so we have

y=x^{-1}=\dfrac25\implies x=\dfrac52

y=x^{-1}=3\implies x=\dfrac13

5 0
3 years ago
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