Question

${x }^{2} + 6x - 72$
please answer....​

Answer 1

Answer:

EXPLANATION.

Discriminant of the equation.

⇒ F(x) = -3x² + 2x - 8 = 0.

As we know that,

Discriminant = D.

⇒ D = 0  Or b² - 4ac = 0.

⇒ D = (2)² - 4(-3)(-8).

⇒ D = 4 - 96.

⇒ D = -92.

Option [A] is correct answer.

                                                                                     

MORE INFORMATION.

Nature of factor of quadratic expression.

(1) = Real and different, if b² - 4ac > 0.

(2) = Rational and different, if b² - 4ac is a perfect square.

(3) = Real and equal, if b² - 4ac = 0.

(4) = If D < 0, Roots are imaginary and unequal Or complex conjugate.

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