Question: A-Level Mathematics problem!!? Prove that (24-x)(x-8)-k is negative for all real values of x provided that k>64\nHence show that expression (6+y)(4-y)(y+4)(y-2)-65 is negative for all real values of y

Answer: use the formula b*2-4ac<0 because for if all values of x is negative then the curve will pass totally under the x-axis\n\nb*2 is b to the power of 2
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