exam Maths Puzzle Numerical Ability

can you help me with this i do not understand it. can you show me step by step.

factor completely
x^2 - 5x - 14

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exam Other Question

I have a real stinker problem here, can you help me?

Evaluate the expression if a= -3, b = 4, c= -5, and d = -6.

b^2 - 2bc + c^2

b^2 means b squared; c^2 means c squared

Thank you.
Please give me an example of an integer in an equation this is not a natural number.

Please give me an example of a real number in an equation that is not a rational number.