exam Maths Puzzle Numerical Ability

given: g is between f and h. h is between g and j.
Prove:fg + gj = fh + hj

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exam Other Question

Find the zeros of the polynomial function and state the multiplicity of each. Graph the polynomial function. Factor first if the expression is not in factored form.
f(x)=3x squared (x-2)(x+1) x-2/3=4/5
or (x-2)/3= 4/5
0r x-2=12/5
or x=12/5 + 2/1 = (12+10)/5 = 22/5 = 4.4