Help me with my homework please /wsr/

File: 1429637678962.jpg (21KB, 372x260px) Image search: [Google] [Yandex] [Bing]

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>>94306
That's totally fucked up. What grade are you in? Age? Depending on it there are different methods for this.

https://www.wolframalpha.com/input/?i=7x%5E2%2B15x-18%3D0

x1=-3
x2=6/7

>>94307
We've been doing quadratics and the whole HW on them.

>>94309
wont get the marks need every step,thanks anyway

>>94314
Here's a hint: subtract 9/x from both sides and find the common denominator of all the terms.

>>94332
But that doesn't leave me with any x variables to show that it simplifies to the equation in the image

>>94306
First you subtract from each side of the equation 9/x to obtain 0 on the right side.

Then you put () around the left side.

Now look at the terms with x. You cannot divide by 0, so let x be different from 0 and from -2.

Multiply both sides with x (not equal to 0) to get rid of the x in the denominator and again with (x+2) (again not equal to 0) to get rid of the x+2 in the denominator.

So you have at first x(x+2)(....) = x(x+2)0 = 0

Now multiply distributively the parentheses and simplify by collecting the same powers of x.

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>>94363
wrong-o

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>>94306

get common denominators.
>multiply both sides by (x+2)
7 + (10 / (x+2)) = (9/x)
7(x+2) +10 = (9/x)(x+2)
7x+24=9+(18/x)
7x+15=(18/x)
>multiply both sides by (x)
x(7x+15)=x(18/x)
7x^2 +15x = 18
7x^2 +15x -18 = 0