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denis-greek [22]
3 years ago
8

Solve x2 - 8x + 14 = 2x - 7

Mathematics
1 answer:
BabaBlast [244]3 years ago
7 0

Answer:

x=7, x=3

Step-by-step explanation:

             x^{2} -8x+14=2x-7

x^{2} -8x-2x+14+7=0

            x^{2} -10x+21=0

\mathrm{For\:a\:quadratic\:equation\:of\:the\:form\:}ax^2+bx+c=0\mathrm{\:the\:solutions\:are\:}

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

positive

x=\frac{-\left(-10\right)+\sqrt{\left(-10\right)^2-4\cdot \:1\cdot \:21}}{2\cdot \:1}

x=7

negative

x=\frac{-\left(-10\right)-\sqrt{\left(-10\right)^2-4\cdot \:1\cdot \:21}}{2\cdot \:1}

x=3

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Step-by-step explanation:

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8 0
3 years ago
The pH of solution A is 2.4​, while the pH of solution B is 9.4.
pishuonlain [190]

Answer:

The answer to your question is below

Step-by-step explanation:

pH definition

                         pH = - log [H⁺]

a) For pH = 2.4, solution A

                       2.4 = -log[H⁺]

                      [H⁺] = antilog⁻².⁴

                      [H⁺] = 0.00398

  For pH = 9.4, solution B

                       [H⁺] = antilog⁻⁹.⁴

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b) Divide hydrogen-ion concentration of solution A by hydrogen-ion concentration of solution B.

                             0.00398 / 3.98 x 10⁻¹⁰

                             10000000 times

c) By 7, because 7 is the number of zeros

3 0
3 years ago
Where does f(x) = 3x2 – 11x – 4 intersect the x-axis?
RideAnS [48]
X= -1/3 (negative x-intercept)
x=4 (positive x-intercept)
4 0
3 years ago
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oee [108]

Answer:

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Step-by-step explanation:

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f(a) = 0

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Get f(-3)

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f(-3) = 81 - 216 + 99 + 33 + 3

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f(-3)  = 0

<em>Since the remainder of the polynomial when divided by x+3 is zero, this shows that x+3 is a factor of the given polynomial</em>

<em></em>

8 0
2 years ago
Estimate the limit of x-3/x^2-9
julsineya [31]

Answer:

b

Step-by-step explanation:

7 0
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