exam Maths Puzzle Numerical Ability

How do you solve these problems by using the
quadratic formula x� = 6x - 4 and
x� + 16x + 60 = 5

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exam Other Question

For the function f(x)= -3x^2 + x- 11, determine the difference quotient
f(a+h) - f(a)/h where h is not equal to 0. Simplify your result as much as possible. The sum of the ages of Dorothy and Dorileen is 41. In 5 years, Dorothy will be twice as old as Dorileen. ind their age 3 years ago.