CBSE Class 8 Mathematics Algebraic Expressions and Identities Worksheet Set 01

Very Short Answer type Questions

Question. What should be subtracted from (x + y)² to get (x² + y²).
Answer : 2xy

Question. Find the area of a rectangle with length and breadth respectively 5mn and 3ns.
Answer : 15mn²s

Question. Find the value of (29 × 31) – (30² – 1).
[Hint : (a + b) (a – b) = a² – b²]
Answer : 0

Question. Find (1 – x²) if x = 0.1.
Answer : 0.99

Question. Find the value of : (a – b) (a + b) + (b – c) (b + c) + (c – a) (c + a).
Answer : 0

Question. Simplify : 3x(4x – 5) + 3. If x = 1/2 .
Answer : -(3/2)

Question. If a = 5 and b = 3. Find the value of (x + y)² – (x² + y²).
Answer : 30

Question. Find (4/3m + 3/4n) (4/3m - 3/4n)
Answer : 16/9m² - 9/16n²

Question. Simplify : (ab + bc)² – 2ab²c.
Answer : a²b² + b²c²

Question. Find the product of (a + b + c) (a + b – c)
Answer : a² + b² + 2ab – c²

Question. If 2x – 3y = 5 and xy = 4. Find 4x² + 9y².
Answer : 73

Question. Find the square of (2mn + 3n)
Answer : 4m²n² + 12mn² + 9n²

Question. Simplify : (x + y) (x² – xy + y²)
Answer : x³ + y³

Question. If 2x + 3y = 8 and xy = 2. Find 4x² + 9y².
Answer : 40

Question. Find the product of 3(1/5) x 3(4/5) .
Answer : 224/25

Please click on below link to download CBSE Class 8 Mathematics Algebric Expressions and Identities Worksheet Set A