exam Maths Puzzle Numerical Ability

please help me to

simplify

-6 * square root of 2(5*square root of 2 - 5 times the square root of 10)

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exam Other Question

If k(x)=-f(x) what would the new coordinates of P be after the reflection? Give answer in (x, y) form. Multiply the following fractions.

X^2 - 3x - 10/5x * 15x^2/3x- 15