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lukranit [14]
3 years ago
12

Carl is deriving the quadratic equation by completing the square. His work at one of the steps is shown. x + b/na = + or - b^2-4

ac. Carl is not sure what the value of n is. What value should he use to continue deriving the quadratic equation correctly? A. 1 B. 2 C. 3 D. 4
Mathematics
1 answer:
krok68 [10]3 years ago
8 0

Answer:

the correct option is B. 2

Step-by-step explanation:

As given,

x + \frac{b}{na} = ± √b²-4ac

⇒x = -\frac{b}{na} ± √b²-4ac

As e know that the quadratic formula is

x = \frac{-b + or - \sqrt{b^{2} - 4ac }  }{2a}

So , by comparing with the formula

we get

n = 2

So, the correct option is B. 2

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Answer:

$6.25 marked up 25% is $7.81

Step-by-step explanation:

First, you have to find what 25% is of 6.25.

Step 1: Our output value is 25.

Step 2: We represent the unknown value with x.

Step 3: From step 1 above, 25=100%.

Step 4: Similarly, x=6.25%.

Step 5: This results in a pair of simple equations:

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Step 6: By dividing equation 1 by equation 2 and noting that both the RHS (right hand side) of both

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1.56+6.25= 7.81

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