Question

solve the quadratic equation 9y²- 100 = 0 by factorization method​

Answer 1

Answer:

9y^2-100=0

9y^2=100

y^2=100/9

y=3.3

Answer 2

Answer:

9y^2-100 =0

(3y)^2-(10)^2=0

using identity

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

(3y+10) (3y-10) =0

(3y+10)=0 or (3y-10)=0

3y=-10 or 3y= 10

y=-10/3 or y=10/3