exam Maths Puzzle Numerical Ability

i do not understand the steps to simplyfing radiscals by using division property of radicals, please help me with the steps

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exam Other Question

the perimeter of the rectangle is 34 cm. the perimeter of teh triangle is 30 cm. Find the values of m and n.

Shown rectangle with short side of m and long side n.
Right triangle with short side m, base n, and hypotenuse n+1.
what is the answer step by step to the following quadratic equations ?
x squared-4x-15=0
x squared+8x-33=0
x squared+5x+2=0
3xsquared-3x+6=0
Help would be great i need it bad