x²-2x＜7 It's a process!

x²-2x＜7 It's a process!

analysis
x²-2x

X & # 178; - 16x = 48 is this a quadratic equation with one variable? How many solutions
Give me a definite answer
Don't be what or what

There's a mistake upstairs
x^2 - 16x - 48 = 0
From the root formula: x = (- B ± √ (b ^ 2 - 4ac)) / 2A = (16 ± √ (16 ^ 2 - 4 × 1 × (- 48))) / 2
= 8 ± √448/2
= 8 ± 4√7

Solving quadratic equation of one variable 0.01y & # 178; = 49 by formula method

0.01y²=49
0.01y²-49 =0
(0.1y+7)(0.1y-7)=0
∴y1=-70,y2=70

x²+16x+63=0

What are you thinking upstairs... (x + 8) ^ 2 = 1, x = - 1-8 = - 9 or x = 1-8 = - 7
Or (x + 7) (x + 9) = 0, x = - 7 or x = - 9