Solve the quadratic equation 12x^2 - 3x -9=0

B

Step-by-step explanation:

Given

12x² - 3x - 9 = 0 ( divide all terms by 3 )

4x² - x - 3 = 0

Consider the factors of the product of the x² term and the constant term which sum to give the coefficient of the x- term.

product = 4 × - 3 = - 12 and sum = - 1

The factors are - 4 and + 3

Use these factors to split the x- term

4x² - 4x + 3x - 3 = 0 ( factor the fist/second and third/fourth terms )

4x(x - 1) + 3(x - 1) = 0 ← factor out (x - 1) from each term

(x - 1)(4x + 3) = 0

Equate each factor to zero and solve for x

x - 1 = 0 ⇒ x = 1

4x + 3 = 0 ⇒ 4x = - 3 ⇒ x = -

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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the answer is 62.8 cubic units