Question

Solution using suitable identity (3x +4) (3x - 5)

Answer 1

Answer:

9x^2 - 3x - 20

Step-by-step explanation:

( x + a ) ( x + b )=x ^2 + ( a +b ) x + a b

here : x = 3x

a = 4

b = -5

(3x)^2 + ( 4 + (-5))3x + (4 * -5)

= 9x^2 + (-1 * 3x) + (-20)

= 9x^2 - 3x - 20

Answer 2

(3x+4)(3x-5)

9x^2-15x+12x-20

3x(3x-5)+4(3x-5)

3x+4=0. 3x-5=0

3x=-4. 3x=5

X=-4/3. x=5/3

-4/3, 5/3 are the solutions to the question

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