Bài 3: Tìm x
a) (2x+3)2−4x2=10
b) (x+1)2−(2+x)(x−2)=0
c) (5x−1)(1+5x)=25x2−7x+15
d) (4−x)2−16=0
e) 3x2−12x=0
g) x2−8x−3x+24=0
Tìm x biết:
a, 16x² – 9(x + 1)²= 0
b, x2 (x – 1) – 4x2 + 8x – 4 = 0
c, x(2x – 3) – 2(3 – 2x) = 0
d, (x – 3)(x² + 3x + 9) – x(x + 2)(x – 2) = 1
e, 4x² + 4x – 6 = 2
f, 2x² + 7x + 3 = 0
Tìm x:
a, x(2x – 3) – 2(3 – 2x) = 0
b, (x – 3)(x2 + 3x + 9) – x(x + 2)(x – 2) = 1
c, 4x2 + 4x – 6 = 2
d, 2x2 + 7x + 3 = 0
4x2 - 7x + 2 = 0 ?????
Tìm x biết ( 2 x – 3 ) 2 – 4 x 2 + 9 = 0
A. x = 1 2
B. x = - 3 2
C. x = 3 2
D. x = 2 3
tìm x
x2−6x+5=0x2−6x+5=0
2x2+7x+9=02x2+7x+9=0
4x2−7x+3=04x2−7x+3=0
2(x+5)=x2+5x
. Tìm x, biết:
a) 4x2 – 9 = 0
b) (x + 5)2 – (x – 1)2= 0
c) x2 – 6x – 7 = 0
d) (x + 1)2 – (2x - 1)2 = 0
x2−6x+5=0x2−6x+5=0
2x2+7x+9=02x2+7x+9=0
4x2−7x+3=04x2−7x+3=0
2(x+5)=x2+5x
Giải các phương trình sau:
a) 2 x − 1 2 + x − 3 2 x − 1 = 0 ;
b) 3 − 2 x 2 + 4 x 2 − 9 = 0 ;
c) 7 − x 2 + 2 3 x − 7 x − 3 = 0 ;
d) 4 3 x − 2 − 3 x − 2 3 = 0 .
tìm x biết: 20x - 4x2 = 0