9x²-30x+c=0 c=? x₁=x₂=?
D=30²-4*9*c=0
900-36*c=0
36*c=900 |÷36
c=25. ⇒
9x²-30x+25-0
(3x)²-2*3x*5+5²=0
(3x-5)²=0
3x-5=0 |÷3
x=5/3.
Ответ: с=25 x₁=x₂=5/3.
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
9x²-30x+c=0 c=? x₁=x₂=?
D=30²-4*9*c=0
900-36*c=0
36*c=900 |÷36
c=25. ⇒
9x²-30x+25-0
(3x)²-2*3x*5+5²=0
(3x-5)²=0
3x-5=0 |÷3
x=5/3.
Ответ: с=25 x₁=x₂=5/3.