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2 years ago

Find the sum of the first 20terms of this arithmetic progression: 2,5,8,11,.......

1 answer:

8 0

Y = -1 + 3x... y1= 2, y2=5... so the 20th term will be 59. There will be ten pairs (i.e 2,59 equal 61... 5,56 equal 61) so multiply this 61 by 10 and your sum will be 610

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2 years ago

5. Find the discriminant of 15x2 = 4x – 1 and describe

diamong [38]

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a) The discriminant of the equation = - 44

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c) $x = \frac{2 +\sqrt{11} i}{15} or, x = \frac{2 - \sqrt{11} i}{15}$

Step-by-step explanation:

Here, the given expression is $15x^{2} = 4x -1$

or, $15x^{2} - 4x + 1 = 0$

Now the discriminant (D) of a quadratic equation $ax^{2} +b x + c = 0$

D = $b^{2} - 4ac = (-4)^{2} - 4(15) (1) = 16 - (60) = -44$

Hence, the discriminant of the equation = - 44

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2 years ago

Find the sum of the first 20terms of this arithmetic progression: 2,5,8,11,.......​

Find the sum of the first 20terms of this arithmetic progression: 2,5,8,11,.......