Question

6. The roots of the quadratic
equation 4x2 + 13x + 9, by
quadratic formula method are
О 1 and 9/4
O-1 and 9/4
0 1 and -9/4
0-1 and -9/4​

Answer 1

Answer:

-1 and 9/4

Step-by-step explanation:

let:

4x^2 + 13x + 9 = 0

4x^2 + (4 + 9)x + 9 = 0

4x^2 + 4x + 9x + 9 = 0

(4x^2 + 4x) + (9x + 9) = 0

4x(x + 1) + 9(x + 1) = 0

(4x + 9) (x + 1) = 0

4x + 9 = 0 or x + 1 = 0

x = -9/4 or x = -1

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