Question

Factorise and also explain

9x^2-3x-20

Answer 1

Given: The quadratic equation 9x^2 - 3x - 20 = 0

To find: Factorise the given equation.

Solution:

• We have given the quadratic polynomial, that is:

            9x^2 - 3x - 20 = 0

• The roots of the equation are:

            3 ± √(-3)² - 4(9)(-20) / 2(9)

            3 ± √(9 + 720) / 18

            3 ± √729 / 18

            3 ± 27 / 18

            30 / 18, -24 / 18

            5/3 and -4/3

• So the factors are: (x - 5/3) ( x + 4/3)

Answer:

        So the factorisation of 9x^2 - 3x - 20 is (x - 5/3) ( x + 4/3)

Answer 2

Step-by-step explanation:

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