exam Maths Puzzle Numerical Ability

x^2 + 9x + 20 =(x + 1)(x + 20)
Is this right?

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exam Other Question

can you please help me: (((find the hypotenuse of a right triangle with sides 5 inches and 10 inches))) Show that the function f(x)=x/x-4 is a one to one function

Find the inverse of the function

Thank you tutors