Question

8. Solve by formula method 9x2 + 7x - 2 = 0​

Answer 1

Answer:

${9x}^{2} + 7x - 2 = 0$

Answer 2

Step-by-step explanation:

${9X}^{2} + 7X - 2 = 0$

${9X}^{2} +9X - 2X - 2 = 0$

$9X(X + 1) - 2(X + 1) = 0$

$(9X - 2)(X + 1) = 0$

$9X - 2 = 0 OR X + 1 = 0$

$X = \frac{2}{9} OR x = - 1$

$Therefore, x = \frac{2}{9} = - 1$

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