giúp mik kiểm tra 2 câu này vs
a) (x+1)(x+9)=(x+3)(x+5)
<=>x^2+10x+9=x^2+8x+15
<=>x^2+10x+9-x^2-8x-15=0
<=>9x-6=0
<=>9x=6
<=>x=6/9=2/3 => S= 2/3
d) (3x+5)(2x+1)=(6x-2)(x-3)
<=>6x^2+13x+5=6x^2-16x+6
<=>6x^2+13x+5-6x^2+16x-6=0
<=>29x-1=0
<=>29x=1
<=>x=1/29
Tìm x:
a) x^2 + 4y^2 + 6x - 12y + 18 = 0
b) 5x^2 +9y^2 - 12xy - 6x +9 = 0
tìm x: x^3-6x^2+12x-8=0
b)16x^2-9(x+1)^2+0
c)-27+27x-9x^2+x^3=0
d)x^2-6x+5=0
a, (2x+3)2-(x-2)2=0
b, (x – 1) 2 – x2 – 6x–9 = 0
a) Tính (6x³++11x²-12x-9) b) Tìm x biết 1) 2x²+4x-0 2) (x+2)²-(x+2)(x+1)-0
Tìm x biết
a)(x+3)^2(x-2)^2=2x b)7x(x-2)=(x-2) c)8x^3-12x^2+6x-1=0
d)4x^2-9-x(2x-3)=0 e)x^3+5x^2+9x=-45 f)x^3-6x^2-x+30=0
giải phương trình (x^2-6x+9)^3+(1-x^2)^3+(6x-10)^3=0
help me!!!!!!!!
. 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
tìm x biết
1, x mũ 3 + 4x mũ 2 + 4x = 0
2, ( x + 3 ) mũ 2 - 4 = 0
3, x mũ 4 - 9x mũ 2 = 0
4, x mũ 2 - 6x + 9 = 81
5, x mũ 3 + 6x mũ 2 + 9x - 4x = 0