exam Maths Puzzle Numerical Ability

(x^2-2x-15)(x-4)=0 solve by finding roots

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exam Other Question

evaluate 7 - 2(15-2 to the 3rd power) 3 to the 2nd power - 5 (3) This is the best way I can type it.

Thanks
which of them are rational or irrational.
3*3.142,2/3.142,square root of 3,square root of16-9,