# Thread: how do i solve these

1. ## how do i solve these

hi i'm reading a precalculus book and I'm very bad at math right now I'm stuck at solving these:

how do i do it?

also in here:

how does the last step happen?

2. ## Re: how do i solve these

(b) simplify the $\dfrac{3}{15}$ in the denominator first, then multiply numerator and denominator by the common denominator of all the fractions in the complex fraction ...

$\dfrac{10}{10} \cdot \dfrac{\frac{2}{5}+\frac{1}{2}}{\frac{1}{10}+\frac {1}{5}} = \dfrac{4+5}{1+2} = \dfrac{9}{3} = 3$

now, you try the same method with (a)

$\sqrt{45} = \sqrt{9 \cdot 5} = \sqrt{9} \cdot \sqrt{5} = 3 \sqrt{5}$

3. ## Re: how do i solve these

i got 8 over 3 for (a) is this correct. I think I'm missing a step...

4. ## Re: how do i solve these

Originally Posted by mohsentux
i got 8 over 3 for (a) is this correct. I think I'm missing a step...
that would be correct

5. ## Re: how do i solve these

Originally Posted by skeeter
that would be correct
YEEEEEEEES I DID IT. I'M THE MASTER. Thanx skeeter.