Question

Question 1

Subtract 3x2 – 5y – 2 from 5y – 3x2 + xy and find the value of the result if x = 2, y = -1.

Question 2.

Simplify the following expressions and then find the numerical values for x = -2.
(i) 3(2x – 4) + x2 + 5
(ii) -2(-3x + 5) – 2(x + 4)

Question 3

Add:
(i) 3x2y, -5x2y, -x2y
(ii) a + b – 3, b + 2a – 1

Question 4.
Subtract 3x2 – x from 5x – x2.​

Answer 1

Answer:

Q1: 18, Q2: (i) -15,  (ii) -26,  Q3 (i)7x^2y,  (ii)-26,  Q3 4x^2-6x

Step-by-step explanation:

Answer 2

Question 1.

Identify in the given expressions, terms which are not constants. Give their numerical coefficients.

(i) 5x – 3

(ii) 11 – 2y2

(iii) 2x – 1

(iv) 4x2y + 3xy2 – 5

Solution:

Algebraic Expressions Class 7 Extra Questions Maths Chapter 12 Q1

Question 2.

Group the like terms together from the following expressions:

-8x2y, 3x, 4y, −32x , 2x2y, -y

Solution:

Group of like terms are:

(i) -8x2y, 2x2y

(ii) 3x, −32x

(iii) 4y, -y