# can anyone help me solve this

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#1
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3 weeks ago
#2
(Original post by EDX_brutality)
How far have you got?
You need to expand (root a + b root c)^2 first
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#3
(Original post by Muttley79)
How far have you got?
You need to expand (root a + b root c)^2 first
Hi
I expanded and simplified and got a+2b*sqrt ac+b²c how do you put this in p+q sqrt c form??
0
3 weeks ago
#4
(Original post by EDX_brutality)
Hi
I expanded and simplified and got a+2b*sqrt ac+b²c how do you put this in p+q sqrt c form??
Try comparing the coefficients ...

p = ...

q =

remembering sqrt ac = sqrt a multiplied by sqrt c
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#5
(Original post by Muttley79)
Try comparing the coefficients ...

p = ...

q =

remembering sqrt ac = sqrt a multiplied by sqrt c
Now i got 2a+2b+b²+c* sqrt c
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3 weeks ago
#6
(Original post by EDX_brutality)
Now i got 2a+2b+b²+c* sqrt c
How?

p = a + cb^2

Now q = ....
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