Question

Asked Oct 15, 2019

In the expression below, a is an integer.

12x^{2} + ax -20

If 3x +4 is a factor of the expression above what is the value of a?

Step 1

3x+4 is a factor so by factor theorem ,

3x+4=0

x= -4/3 is a zero of the equation.

Step 2

f(-4/3) =0, because x=-4/3 is a zero of f(x).

Using this we ...

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