exam Maths Puzzle Numerical Ability

Find the domain and range for the function. Use interval notation.

f(x)= (x^2 + x - 12)/[(x-3)(x+5)]

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exam Other Question

can some one check this for me please

sqrt7(8sqrt6-3sqrt7)
(sqrt7*8sqrt6)-3*7sqrt7
8sqrt42-3*7sqrt7
8sqrt42-(7*7)
8sqrt42-21
Can you help me with this problem?

Find three consecutive integers whose sum is 321