3 years ago

Pls help! Use the quadratic formula to solve the equation -x^2+7=5

Mathematics

1 answer:

Mrrafil [7]3 years ago

3 0

Answer:

x = -√2, x2 = √2

Alternative Form:

x1 = -1.41421, x2 = 1.41421

Step-by-step explanation:

-x²+7-5 = 0

-x²+2 = 0

x = -0±√0²-4×(-1)×2 [over] 2×(-1)

x = ±√0+8 [over] -2

x = ±√8 [over] -2

x = ±2√2 [over] -2

x = -±2√2 [over] 2

x = -2√2 [over] 2

x = --2√2 [over] 2

x = -√2

x = √2

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kobusy [5.1K]

Answer:

7 5/12

Step-by-step explanation:

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4 0

3 years ago

The hardware store where you work charge 80 cents including tax, for a pound of nails. A customer purchases 5 3/4 pound of nails

Sophie [7]

Answer:

$4.60

Step-by-step explanation:

1 lb ---> 80 cents

5 3/4 lb ---> 5 3/4 * 80 cents

$5 \dfrac{3}{4} \times 80 =$

$= \dfrac{23}{4} \times \dfrac{80}{1}$

$= \dfrac{23 \times 80}{4 \times 1}$

$= \dfrac{1840}{4}$

$= 460$

460 cents = $4.60

5 0

3 years ago

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Which equation represents an exponential function that passes through the point (2,80)

Anon25 [30]

Answer:

Step-by-step explanation:

The point (2,80) has the input value x = 2.

Substitute x = 2 into each function.

$f(x) = 5 (4^x)\\f(2) = 5(4^2)\\f(2) = 5 *16\\f(2) = 80$

8 0

3 years ago

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I don't get it. Can you also explain why and the steps

Fynjy0 [20]

I think this shows more helpful to u
any other question about this ask me!!

7 0

3 years ago

What is answer plz help

sp2606 [1]

Answer:

y=1

Step-by-step explanation:

When x= -4, y=1, i don't know how else to explain it. Find the y value of the graph at that point.

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2 years ago

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