\(x^2-25=0\)
\(x^2=25\)
\(\Rightarrow x^2=5^2\)
\(\Rightarrow x=5\)
\(x^2-25=0\\ x^2=0+25\\ x^2=25\\ x^2=5^2\\ \Rightarrow x=5.\)
Tìm \(x\)
a, \(x^2-10x+25=0\)
b, \(x^2-8x+16=0\)
c, \(x^2-49=0\)
d, \(4x^2-25=0\)
Tìm x biết 2(x+3)-x^2-3x=0
x^3+27+(x+3)(x-9)=0
4x^2-25-(2x-5)(2x+7)=0
8x^3-50x=0
(2x-1)^2-25=0
a, Cho `0<x<25`
Tìm GTLN:`(80-2x)(50-2x)x`
b, `0<x<2`. Tìm GTLN: `5x(2-x)`
c, `x≥2`. Tìm GTLN: `x + 1/x`
d, Cho `x,y>0, x+y≤1`. TÌm GTNN: `x + y + 1/x + 1/y`
\(a,2x^2+8x=0\)
\(b,x^2-25+\left(x-5\right)^2=0\)
Tìm x
Tìm x biết: (x^2-25)^2-(x+5)^2=0
BT8: Tìm x, biết
\(a,\left(x-2\right)\left(x-3\right)=0\)
\(b,x^2-5x=0\)
\(c,x^2-9=0\)
\(d,4x^2-25=0\)
Tìm x a)(5x-3)(3x+1)-(15x+1)(x-2)=0 b)x²+(x+5)(x-3)-25=0
Tìm x: 2(x - 5) - x^2 + 25 = 0
Tìm x biết:
a) 2.(x - 4) - x + 3 = 0
b) x^2 - 25 - x - 5 =0
c) x^2 - 2x - 15 = 0
Tìm x, biết:
a) 3x(x - 1) + x - 1 = 0;
b) (x - 2)( x 2 + 2x + 7) + 2( x 2 - 4) - 5(x - 2) = 0;
c) ( 2 x - 1 ) 2 - 25 = 0;
d) x 3 + 27 + (x + 3)(x - 9) = 0.
