Question

9y^2-20


this is my question can anyone help me​

Answer 1

Answer:

hope this helps u :-)

Step-by-step explanation:

9y²-20

3²y² -  20  = 0

Factoring:  9y²-20  

Theory : A difference of two perfect squares,  A²- B² can be factored into  (A+B) * (A-B)

9y²-20 = 0  

Add  20  to both sides of the equation :  

                     9y²= 20

Divide both sides of the equation by 9:

                    y²= 20/9 = 2.222

 

When two things are equal, their square roots are equal. Taking the square root of the two sides of the equation we get:  

                     y  =  ± √ 20/9  

The equation has two real solutions  

These solutions are  y = ±√ 2.222 = ± 1.49071  

y = ±√ 2.222 = ± 1.49071