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andriy [413]
3 years ago
11

Simplify (7 – c)(–1)

Mathematics
2 answers:
vichka [17]3 years ago
8 0

Answer:

-7 + c

Step-by-step explanation:

Given the expression

(7 - c)(-1)

Distribute -1 in (7 - c)

That is

-1 x 7 -1 x - c

Negative times negative becomes positive while negative times positive becomes negative.

Therefore, we now have

-7 + c

Shkiper50 [21]3 years ago
4 0

Answer:

-7 + C in other form, C + 7

Just open the bracket

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Find a quadratic polynomial with integer coefficients which has x = 2/9, ± SQRT23/9 as its real zeros.
melomori [17]

Answer:

The quadratic polynomial with integer coefficients is y = 81\cdot x^{2}-36\cdot x -19.

Step-by-step explanation:

Statement is incorrectly written. Correct form is described below:

<em>Find a quadratic polynomial with integer coefficients which has the following real zeros: </em>x = \frac{2}{9}\pm \frac{\sqrt{23}}{9}<em>. </em>

Let be r_{1} = \frac{2}{9}+\frac{\sqrt{23}}{9} and r_{2} = \frac{2}{9}-\frac{\sqrt{23}}{9} roots of the quadratic function. By Algebra we know that:

y = (x-r_{1})\cdot (x-r_{2}) = x^{2}-(r_{1}+r_{2})\cdot x +r_{1}\cdot r_{2} (1)

Then, the quadratic polynomial is:

y = x^{2}-\frac{4}{9}\cdot x -\frac{19}{81}

y = 81\cdot x^{2}-36\cdot x -19

The quadratic polynomial with integer coefficients is y = 81\cdot x^{2}-36\cdot x -19.

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3 years ago
Your subtotal at the store was $72.29. You have a 40% off coupon. If the sales tax rate is 9.5%, what is the total price for you
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$47.50

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Answer:

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Step-by-step explanation:

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/-9     /-9

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