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                   solve for x; if
log 7(x3+7)-log7(x+3)=2


4 years ago

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                                        log 7(x3+7)-log7(x+3)=2
log(x3+7)/log7 - logx+3/log7 = 2
logx3+7 - logx+3 = 2log7
logx3+7/x+3 = log49
x3+7 = 49x + 49*3
x3 -49x - 20*7 = 0
x3 - 49x - 140 = 0
now solve for x

4 years ago

If x+root y = 11 and root x+y = 7, then how to calculate x and y.

sorry sorry I wrote wrong ya yes x = 9 y = 4

 A M S ARUN KRISHNA one month ago

 PRAPULPODISHETTI one month ago

x=9, y=4

 Anoopam Mishra one month ago
plz can u give me solution of q48 and q49

q49. Sn will be equal to coff. of x in : (1+1/x) n .(1+x) n = ∑ n C i * n C i+1 (that is power x i+1 from second bracket multiplied by power x i of first, and i varying from 0 to n-1....

 Akshay 2 months ago

will be the series in question. n . cofficient of x 2n-2i (-1) j (1+x) i C n = ∑ n -1) 2 q48. Assume ((x+1) Expand (x+1) 2 in LHS and solve. ATB.

 Akshay 2 months ago

q48. Assume ((x+1) 2 -1) n = ∑ n C i (1+x) 2n-2i . cofficient of x n will be the series in question. Expand (x+1) 2 in LHS and solve. ATB.

 Akshay 2 months ago
x+1/x =1 , x 2 +1/x 2 =2 and x 3 +1/x 3 =3 then x 5 + 1/x 5 = what

x^5 + \frac{1}{x^5} = (x^2 + \frac{1}{x^2})(x^3 + \frac{1}{x^3}) - (x + \frac{1}{x} )"...

 Raghu Vamshi Hemadri 28 days ago

x^5 + \frac{1}{x^5} = (x^2 + \frac{1}{x^2})(x^3 + \frac{1}{x^3}) - (x + \frac{1}{x} )"...

 Anoopam Mishra one month ago

5

 pa1 one month ago
The plane ax+by+cz=1 meets the co-ordinate axes in A,B and C. The centroid of the triangle is- (3a,3b,3c) (a/3, b/3, c/3) (3/a, 3/b, 3/c) (1/3a, 1/3b, 1/3c) What i am not understanding is...

The correct answer is (D). First of all, it should be clear that a,b,c are not the intercepts of the axes x,y,z resp. If that is true then (a,0,0), (0,b,0) and (0,0,c) should satisfy the eq ...

 Yash Jain 9 months ago

 Gayatri Jayesh Bondriya 2 months ago
If u=f(x) and v=g(x) then d(uv)/dx is

its quite simple , rather its product rule for differentiation anyway uv=f(x).g(x) d(uv)/dx = f(x) g , (x) + g(x) f , (x) it is answer APPROVE IF USEFUL

 ng29 4 months ago

its very simple first take gx constant and diffrentiade and similarly take fs constant and diffrentiate gx

hey are you solving integration by parts but all the way answer is d(uv)/dx = f(x) g , (x) + g(x) f , (x)

 Gman Namg 4 months ago
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