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Year 11 maths

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My teacher said

If x-2(square root xy)=9-4(square root 2)
so since there are two square roots
-2(square root xy) equals -4(square root 2)

How is this possible, could the values be different and they are not equal.

  • Year 11 maths -

    your teacher is dead wrong.

    example:

    6-sqrt25=15-sqrt196
    sqrt25 is not equal to sqrt196, ever.
    Point this out to your teacher.

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