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aivan3 [116]
3 years ago
12

Which is true about the polynomial 9x²y – 6x - 5y^2

Mathematics
1 answer:
Ostrovityanka [42]3 years ago
7 0

Answer:

D

Step-by-step explanation:

It is a trinomial with a degree of 3.

This is the correct answer on the exam.

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Ba = 8,ac = 16 is the correct one
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This kind of stuff makes 0% sense to me
ser-zykov [4K]

Answer:

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Step-by-step explanation:

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Anna35 [415]

Answer:

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Step-by-step explanation:

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3 years ago
Solve for x in the equation x2 - 4x - 9 = 29.
Oxana [17]

Answer:

x = 2 + \sqrt{42}   or   x = 2 - \sqrt{42}

Step-by-step explanation:

x^2 - 4x - 9 = 29

Subtract 29 from both sides.

x^2 - 4x - 9 - 29 = 29 - 29

x^2 - 4x - 38 = 0

There are no two integers whose sum is -4 and whose product is -38, so the trinomial is not factorable. We can use the quadratic formula.

a = 1; b = -4; c = -38

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

x = \dfrac{-(-4) \pm \sqrt{(-4)^2 - 4(1)(-38)}}{2(1)}

x = \dfrac{4 \pm \sqrt{16 + 152}}{2}

x = \dfrac{4 \pm \sqrt{168}}{2}

x = 2 \pm \dfrac{\sqrt{4 \times 42}}{2}

x = 2 \pm \dfrac{2\sqrt{42}}{2}

x = 2 \pm \sqrt{42}

x = 2 + \sqrt{42}   or   x = 2 - \sqrt{42}

3 0
4 years ago
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