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3 years ago

Solve 3x2 − 7x − 2 = 0.

Mathematics

2 answers:

EleoNora [17]3 years ago

4 0

3x2-7x-2 = 0.

so x=4/7

marishachu [46]3 years ago

3 0

3*2-7x-2=0
3*2-2=7x
6-2=7x
4=7x
7/7x=4/7
x=0.5714285
this is my idea.

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pogonyaev

ANSWER
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EXPLANATION
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3 years ago

Solve the equation. a/6 - 11 = 25

blsea [12.9K]

Answer:

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Step-by-step explanation:

What you do is you need to get a by itself.

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3 years ago

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The 16th term of an A.P. is 40 and the sum of the first 5 terms is 5. Find the sum of the first 50 terms.

KiRa [710]

Answer:

The sum of first 50 terms is 3425.

Step-by-step explanation:

Let the first tem of A.P be 'a' and it's common difference be 'd'

Thus the 16th term of the A.P is given by

$T_n=a+(n-1)d\\\\40=a+15d..........(i)$

Now we know that the sum of first 'n' terms of the A.P is given by

$S_n=\frac{n}{2}[2a+(n-1)d]\\\\5=\frac{5}{2}[2a+4d]\\\\1=a+2d..........(ii)$

Solving equation 'i' and 'ii' simultaneously we get

$40=1-2d+15d\\\\13d=39\\\\\therefore d=3$

Thus $a=1-2\times 3=-5$

Thus the sum of first 50 terms euals

$S_{50}=\frac{50}{2}[2\times -5+(50-1)3]\\\\S_{50}=3425.$

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3 years ago

Read 2 more answers