Question

what makes this equation true

Answer 1

here r the questions

Answer 2

help me please

Answer 3

Hey marxin :P

Answer 4

Okay for the first one:Add the 4
sqrt(2a)=6
square both sides:
2a=36
divide by 2.
a=18

Answer 5

For the second one, I would factor out the - giving:
x^2+4x+3=0 This gives you (x+1)(x+3) so your solutions are -1 and -3

Answer 6

hold on do 10 some on another page did 6-9

Answer 7

The next one might be a bit tricky to explain. But I'll do my best. You need to get a common denominator on the left.
\[\frac{20(n-2)-1(n+2)}{(n-2)(n+2)}=\frac{15}{(n-2)(n+2)}\].
So the top must equal 15.

Answer 8

Okay. 10 then:
You just need to use the quadratic formula.
\[\frac{8 \pm \sqrt{(-8)^2-4(-1)(1)}}{2(1)}\].

Answer 9

hello???

Answer 10

I'm here, you want 11 too? :P You said 10 haha

Answer 11

oh srry yea 11 would be awesom alsowhere u at in da world

Answer 12

Virginia, US let me look at it, 2 seconds

Answer 13

Atlanta, Georgia here

Answer 14

Okay, start my multiplying by 9 and x:
\[9(8+x)=x(x+10)\].
Gives:
\[72+9x=x^2+10x\].
Combining:
x^2+x-72=0
Which factors to:
(x+9)(x-8)=0

Answer 15

So the answer is x= +8 and -9. You just have your signs switched again :P

Answer 16

thnaks man

Answer 17

No problem :P