1.

Find the zeroes of the quadratic polynomials 3x2 + x – 4 = 0.

Answer»

Let f(x) = 3x2 + x ˗ 4

= 3x2 + 4x - 3x ˗ 4

= x (3x + 4) - 1(3x + 4)

= (3x + 4) (x ˗ 1)

To find the zeroes, set f(x) = 0

(3x + 4) (x ˗ 1) = 0

3x + 4 = 0 or x ˗ 1 = 0

x = -4/3 or x = 1



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