Math help please (1 Viewer)

dazzle · Feb 15, 2016

hello people

I'm unsure how to do this question

evaluate a and b if

(2√2-√5)(√2-3√5)=a+b√10

InteGrand · Feb 15, 2016

dazzle said:
hello people

I'm unsure how to do this question

evaluate a and b if

(2√2-√5)(√2-3√5)=a+b√10

$\noindent Expanding the LHS, $LHS = 2 \times 2 - 6\sqrt{10} - \sqrt{10} + 3 \times 5 = 19-7\sqrt{10}$ $\Big{(}$note $\sqrt{2}\times \sqrt{5} = \sqrt{10}$$\Big{)}$. Hence $a=19$, $b=-7$, assuming we are after rational solutions $(a,b)$.$

dazzle · Feb 15, 2016

thanks nigga

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Math help please (1 Viewer)

dazzle

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InteGrand

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dazzle

New Member

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