exam Maths Puzzle Numerical Ability

find the domain of the function f(x)= 1
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2
x + 7x - 8

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exam Other Question

Can someone help me on this problem?

I need to evaluate: |6| + |-15|

Thank you,
Lyn Please help me with this problem:

[x-(-6+ the square root of 13)][x-(-6)-the square root of 13)] Find the product.

Thank you for your help!