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sergij07 [2.7K]
3 years ago
12

2) Justify with proper reasoning: (i) The multiplicative inverse of (-4)^(-2) is 4^2. Pls answer fast...

Mathematics
1 answer:
Alja [10]3 years ago
7 0

Answer:

Below.

Step-by-step explanation:

-4^{-2} = \frac{1}{-16}

The multiplicative inverse is basically the opposite reciprocal.

In this case, it is 16

16 = 4^2

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How do you solve this question?
aliya0001 [1]
We can use the quadratic formula to solve this problem.

\sf x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

You've already listed the values for 'a', 'b', and 'c', so just plug them into the formula:

\sf x=\dfrac{-(-12)\pm\sqrt{(-12)^2-4(4)(9)}}{2(4)}

Simplify:

\sf x=\dfrac{12\pm\sqrt{144-4(4)(9)}}{8}

Multiply:

\sf x=\dfrac{12\pm\sqrt{144-144}}{8}

Subtract:

\sf x=\dfrac{12\pm\sqrt{0}}{8}

Take the square root:

\sf x=\dfrac{12\pm 0}{8}

It doesn't matter if you add or subtract something with 0, you'll end up with the same thing, so we have:

\sf x=\dfrac{12}{8}\rightarrow\boxed{\sf 1\dfrac{1}{2}}
8 0
3 years ago
Please help thanks!!!
Julli [10]
The first one is the answer
5 0
3 years ago
Read 2 more answers
Can you simplify this?
Brilliant_brown [7]

144 - 12g^2.

Because we don't know the value of g, there's nothing else we can do.

8 0
3 years ago
The blueprint for Moreno​'s living room has a scale of 2 inches equals 3 feet. The family wants to use a scale of 1 inch equals
Liula [17]

Answer:

Part a) The scale of the new blueprint is      

Part b) The width of the living room in the new blueprint is  

Step-by-step explanation:

we know that

The scale of the original blueprint is

and

the width of the living room on the original blueprint is 6 inches

so

Find the actual width of the living room, using proportion

Find the actual length of the living room, using proportion

Find the scale of the new blueprint, divide the length of the living room on the new blueprint by the actual length of the living room

simplify  

     

Find the width of the living room in the new blueprint, using proportion

7 0
2 years ago
Determine the values of x when f(x)=40 for the function f(x)=2(x-3)^2-8
SpyIntel [72]

Answer:

x = 3 ± \sqrt{24}

or

x = 3 + \sqrt{24}, x = 3 - \sqrt{24}

Step-by-step explanation:

given f(x) = 2(x - 3)^2 - 8, find when f(x) = 40

So, we plug in 40 for f(x) in the 1st equation and solve for x.  (Aim to got x on its own)

40 = 2 (x - 3)^2 - 8

+ 8          + 8

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

48 = 2 (x - 3)^2

/2            /2

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

24 = (x - 3)^2

square root both sides

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

\sqrt{24} = x - 3

x = 3 ± \sqrt{24}

5 0
2 years ago
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