exam Maths Puzzle Numerical Ability

factor:

40x^4y + 52x^3y^2 - 12x^2y^3

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exam Other Question

Use property 1 to simplify the radical expression. Assume the variable represents a positive real number.

sqrt72x^3

sqrt72*x^2*x=

sqrt72x^2 * sqrtX=

9x sqrtX

Is this correct? what is

p to the second minus 10pq plus 16q to the second?
so far i got....(p+16q)(p+q)