EASY
Earn 100

Find the formula a3-b3.

Important Questions on Identities

MEDIUM
If x+1x=3, then x3+1x3 is equal to:
EASY
If x-1x=4 then x2+1x2 is equal to:
HARD
If x+y+z=3, and x2+y2+z2=101, then what is the value of x3+y3+z3-3xyz?
MEDIUM
What is the value of (4.6+3.1)2-(4.6-3.1)2?
EASY
If x+y+z =6xyz =-10 and x2+y2+z2=30, then what is the value of x3+y3+z3?
MEDIUM

If a+b+c=13 and ab+bc+ca=54, then a3+b3+c3-3abc is equal to:

EASY
If a2+b2+c2=300 and ab+bc+ca=50, then what is the value of a+b+c? (Give that a, b and c are all positive)
EASY
If x = 2 + 12 - 1 and y = 2 - 12 + 1, what is the value of x + y?
MEDIUM
Determine the value of m for which 4x+x6+m²4 is a perfect square.
MEDIUM
If 16a4+36a2b2+81b4=91 and 4a2+9b2 6ab=13, then what is the value of 3ab?
MEDIUM
8.73×8.73×8.73+4.27×4.27×4.278.73×8.73-8.73×4.27+4.27×4.27 is equals to :
MEDIUM
If P=x3+y3x-y2-3xyQ=x+y2-3xyx3-y3 and R=x+y2+x-y2x2-y2 , then what is the value of P÷Q×R:
EASY

What is the simplified value of: sin3 21+cos3 19sin 21+cos 19+sin2 69+cos2 71+1sec 69cosec 71 is

EASY
The coefficient of y in the expansion 2y-53, is:
EASY
If x, y, z are three numbers such that x+y=13, y+z=15 and z+x=16, then the value of xy+xzxyz is:
EASY
If x2-4x+4=0, then what is the value of 16x4-1x4 is:
EASY

What is the simplified value of (2.7)3+(1.3)3(2.7)2-2.7×1.3+(1.3)2?

EASY
Determine the value of x2+y2 when x3-y3=54, x-y=18  and xy=2.
EASY

Expand : W-92

1. W2-9W+81

2. w2-9W+18

3. W2-18W+81

4. W2-18W-81