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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अध्याय 3: Algebra - Exercise 3.3 [पृष्ठ ६८]

अध्याय 3 Algebra
Exercise 3.3 | Q 1. (ii) | पृष्ठ ६८

Write the following using literals, numbers, and signs of basic operations:
x increased by 12

If a = 2 and b = 3, find the value of 2a − 3b

If p = −2, q = −1 and r = 3, find the value of p³ + q³ + r³ + 3pqr

Write the coefficient of x in 13x

Write the coefficient of z in −7xz

Write the coefficient of x³ in x³

Subtract:

−7x from 9y

Subtract:

x³ + 2x²y + 6xy² − y³ from y³ − 3xy² − 4x²y

Find the variables from the clues given below and solve the cross-word puzzle.

Across	Down
x + 40 gives 100	x is 1005 multiplied by 6
7 reduced from t gives 31	t ÷ 7 = 5
z is 5 added 5 times	p is the predecessor of first 3 digit number
v is the whole number zero plus number of days in a ordinary year	z is the number of weeks in a year (digits reversed)
k is 24 added to 25	k is 11 times 4
u is 2 added to two times 11 gives the number of hours in a day	u is product of 23 and 9
a is 20 more to 40	a is 4 added to the product of 12 and 5
s minus 1 gives 246 is the number of letters in Tamil language	m is the successor of 9

Form expressions using y, 2 and 7. Every expression must have y in it. Use only two number operations. These should be different.