Question

(2s-10)(2s-90) it is not solve with identity

Answer 1

Answer:

2s(2s-90)-10(2s-90)

4s^2-180s-20s+900

4s^2-200s+900=0

4s^2-180s-20s+900=0

4s(s-45)-20(s-45)=0

(s-45)(4s-20)=0

s-45=0 | 4s-20=0

s=45 | 4s=20

| s=20/4

| s=5

s=45 or s=5