If a = 5, the value of 2a + 5 is ____________

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If a = 5, the value of 2a + 5 is 15

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Chapter 3 Algebra
Exercise 3.3 | Q 1. (ii) | Page 68

Write the coefficient of y in −5y

Write the numerical coefficient of −2x³y²z

Identify the like terms in the following:

3x, 4xy, −yz, `1/2`zy

Add

8a − 6ab + 5b, −6a − ab − 8b, −4a + 2ab + 3b

Subtract:

5x² − 3xy + y² from 7x² − 2xy − 4y²

Let
P = a² − b² + 2ab,
Q = a² + 4b² − 6ab,
R = b² + 6, S = a² − 4ab and
T = −2a² + b² − ab + a.
Find P + Q + R + S − T.

If a note book costs Rs p and a pencil costs Rs 3, then the total cost (in Rs) of two note books and one pencil.

z is multiplied by –3 and the result is subtracted from 13.

Price of petrol was Rs. p per litre last month. Price of petrol now is Rs. (p – 5) per litre.

The sum of two numbers is 60 and their difference is 30.