Question

Using the discriminant (b2 – 4ac) find the number of roots each of this equation has


a) 2x2 – 5x – 4 = 0

b) 2x2 – 5x + 4 =0

Answer 1

Answer:

Number of roots of

$2x {}^{2} - 5x - 4 \\ b {}^{2} - 4ac \\ - 5 {}^{2} - 4 \times 2 \times - 4 \\ 25 - ( - 32) \\ 25 + 32 \\ = 57$