3 years ago

Help me with these questions. If you can put on a separate piece of paper then send it. With the work shown out

Mathematics

1 answer:

natta225 [31]3 years ago

3 0

All you need to do is balqnce the equations so that you can do simultaneous equwtions

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Step-by-step explanation:

Given

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$\Rightarrow x^2-2\cdot 6\cdot x+15=0\\\text{add and subtract 36}\\\Rightarrow x^2-2\cdot 6\cdot x+15+36-36=0\\\Rightarrow x^2-2\cdot 6\cdot x+36+(-36+15)=0\\\text{using}\ (a-b)^2=a^2+b^2-2ab\\\Rightarrow (x-6)^2-21=0\\\Rightarrow (x-6)^2=21\\\Rightarrow x-6=\pm \sqrt{21}\\\Rightarrow x=6\pm \sqrt{21}$

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