# What are the formulas in maths class 8?

## What are the formulas in maths class 8?

Maths Formulas For Class 8: Algebraic Identity

• (a + b)2 = a2 + 2ab + b2
• (a – b)2 = a2 – 2ab + b2
• (a + b) (a – b) = a2 – b2
• (x + a) (x + b) = x2 + (a + b)x + ab.
• (x + a) (x – b) = x2 + (a – b)x – ab.
• (x – a) (x + b) = x2 + (b – a)x – ab.
• (x – a) (x – b) = x2 – (a + b)x + ab.
• (a + b)3 = a3 + b3 + 3ab(a + b)

What are the basic math formulas?

Some examples of the basic math formulas:

• Perimeter of a rectangle = 2 (length + width)
• Area of rectangle = length × width.
• The perimeter of a square = 4 × side length.
• Area of square =Side length × side length.
• The volume of cuboid = length × width × height.
• Profit = Selling price – cost price.

What are the formulas in comparing quantities Class 8?

Comparing Quantities Formulas for Class 8 Maths

• Discount = Marked Price – Sale Price.
• Simple Interest = ( Principal × Rate × Time )/100.
• Compound Interest Formula = Amount – Principal.

### What is the formula of SP for Class 8?

Profit (P)=[Selling Price (S.P.)] −[Cost Price (C.P.)] Profit (P) = [ Selling Price (S.P.) ]

What is the formula of cost price for Class 8?

FAQs on Cost Price Formula Cost price formula when gain (profit) percentage and selling price is given as, Cost price formula = {100/(100 + Profit%)} × SP.

Who invented maths?

Archimedes is known as the Father of Mathematics. Mathematics is one of the ancient sciences developed in time immemorial….Table of Contents.

1. Who is the Father of Mathematics?
4. Notable Inventions
5. Death of the Father of Mathematics
6. Conclusion
7. FAQs

## What is the formula of a2 b2?

a2 – b2 = (a + b)(a – b ) .

What are the top 5 formulas in math?

Arithmetic mean (average) = Sum of values / Number of values.

• Probability = Target outcomes / Total outcomes.
• Quadratic Formula: x = −b ± √b²-4ac/2a.
• Distance Formula: d=√(x₁ – x₂)² + (y₁ – y₂)²
• Slope Formula: Slope = y₂ – y₁ / x₂ – x₁
• Slope Intercept: y=mx+b.
• Midpoint Formula: (x₁+x₂) / 2, (y₁+y₂) / 2.
• How many chapters are there in maths class 8?

16 chapters
There are 16 chapters in the NCERT Maths book of Class 8 and all the chapters are very important for the preparation of CBSE schools and Olympiad exams.

### What is SP and CP?

Answer– CP and SP are abbreviations for Cost Price and Selling Price. Cost price is the amount we pay to buy an item at which it is available. Similarly, Selling Price is the rate at which an article is sold which we abbreviate as SP. Always remember that you calculate profit or loss on the cost price.

What is the formula of SI?

How do you Calculate Simple Interest? Simple Interest is calculated using the following formula: SI = P × R × T, where P = Principal, R = Rate of Interest, and T = Time period.