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sammy [17]
3 years ago
12

.

Mathematics
1 answer:
Elza [17]3 years ago
7 0

Answer:

k = 4

Step-by-step explanation:

Given

4x^2 - 8x + k

Required

Determine k if the expression is a perfect square

A quadratic is of the form;

ax^2 + bx + c

Where (by comparison):

a = 4     b = 8     c = k

If the above is a perfect square, then

k = \frac{b^2}{4a}

Substitute values for a, b and c

k = \frac{8^2}{4*4}

k = \frac{64}{16}

k = 4

<em>Hence, k = 4</em>

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Seven and thirty twp hundreths plus two and one tenth times two and seven tenths minus 18a
alexdok [17]
Answer:  Write the expression as:

" 70 \frac{32}{100} +
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______________________________________________________
or;  write as:
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           " 70.32  + (2.1) * (2.7)  − 18a " ; 
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To simplify:
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  Using "PEDMAS" (the "order of operations") ; 

the "multiplication" comes first; 

So:  →  "(2.1) * (2.7) =  5.67 " .

And rewrite:
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Now:  " 70.32 + 5.67 = 75.99 " ; 

So, we can the final simplified expression as:
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7 0
4 years ago
Select all that apply.
babunello [35]
C.Quadrilateral is the answer for the following because rhombus, trapezoid, isosceles trapezoid have parallel sides.

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3 years ago
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goldfiish [28.3K]

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