Advertisements
Advertisements
प्रश्न
Solve: 3(x + 2) − 2(x − 1) = 7.
उत्तर
3(x + 2) − 2(x − 1) = 7.
or, 3 × x + 3 × 2 − 2 × x − 2 × (−1) = 73 × x + 3 × 2 - 2 × x - 2 × (-1) = 7 [On expanding the brackets]
or, 3x + 6 − 2x + 2 = 7
or, x + 8 = 7
or, x + 8 − 8 = 7 − 8 [Subtracting 8 from both the sides]
or, x = −1
APPEARS IN
संबंधित प्रश्न
Check whether the value given in the bracket is a solution to the given equation or not:
4p − 3 = 13 (p = − 4)
Simplify:
a − (b − 2a)
Simplify:
−4x2 + {(2x2 − 3) − (4 − 3x2)}
Simplify:
2a − 3b − [3a − 2b − {a − c − (a − 2b)}]
Simplify:
5x − [4y − {7x − (3z − 2y) + 4z − 3(x + 3y − 2z)}]
Write the following statement as an equation:
A number increased by 8 equals 15.
Write a statement for the equation, given below:
2y = 18
`1/3(x+7+z)` is a
A rectangular box has height h cm. Its length is 5 times the height and breadth is 10 cm less than the length. Express the length and the breadth of the box in terms of the height.
Change the following statements using expressions into statements in ordinary language.
(For example, Given Salim scores r runs in a cricket match, Nalin scores (r + 15) runs. In ordinary language − Nalin scores 15 runs more than Salim.)
In an arrangement of dots, there are r rows. Each row contains 5 dots.
