Expansion of (x+y+z)^2
Trending Questions
Q.
If (a+b+c) is positive and a2+b2+c2=83 and ab+bc+ca=71
then a+b+c=
Q.
If a+b+c=11 and ab+bc+ac=32
find
a2+b2+c2
57
89
45
67
Q.
If a + b + c = 0 ; then
(a^2 + b^2 + c^2) ÷ (ab +bc + ca) =
-2
1
2
0
Q.
Evaluate (a+2b+3c)2
a2+4b2+9c2+4ab+12bc+6ac
a2+4b2+9c2+8ab+12bc+6ac
a2+4b2+9c2+4ab+12bc+12ac
a2+4b2+9c3+4ab+12bc+6ac
Q.
If a + b + c = 10 and a^2 + b^2 + c^2 = 38
then ab + bc + ca =
31
62
0
100
Q. Expansion of (x+y+z)2 :
- x2+y2+z2+2(xy+yz+zx)
- x2+y2+z2−2(xy+yz+zx)
- x2+y2+z2−2(xy−yz+zx)
- x2+y2+z2+2(xy−yz+zx)
Q.
Which of the following equations are correct?
(i) (a+b+c)2=a2+b2+c2−2(ab+bc+ca)
(ii) (a+b)3=a3+b3+3ab(a−b)
(iii) (a−b)3=a3−b3−3ab(a+b)
(iv) a2−b2=(a+b)(a−b)
(i) and (iv)
(ii), (iii) and (iv)
(iv) only
(iv) and (iii)
Q.
Evaluate If a + b + c = 15 and a2+b2+c2 = 125 , find ab + bc + ca
100
75
81
50
Q. Expand: (3x−2b+5c)2
Q.
If a + b + c = 12 and a2+b2+c2=50; find ab + bc + ca
(x+2)
(x + 2) (x + 3)
(x+3)
x(x+1)