exam Maths Puzzle Numerical Ability

how do u find tha answer to these
2x(3x-7)
5a(3a+2)
2g(3h+5)
5x(7-8x)
3g(4b+20)

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exam Other Question

-2x+x^2-15 Could you please help me?

4 pts) (a) Translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard