Advertisements
Advertisements
प्रश्न
Find x: −3(4x + 9) = 21
उत्तर
Expanding the bracket,
– 3 × 4 + (– 3) × 9 = 21
∴ – 12x + (– 27) = 21
– 12x – 27 = 21
Transposing – 27 to other side, it becomes + 27
– 12x = 21 + 27 = 48
∴ – 12x = 48
⇒ 12x = – 48
Dividing by 12 on both sides
`(12x)/12 = (-48)/12`
⇒ x = – 4
APPEARS IN
संबंधित प्रश्न
The value of y in the equation y – 9 = (– 5) + 7 is ________
Find x: 20 – 2(5 – p) = 8
Find the perimeter of a triangle whose sides are x + 3y, 2x + y, x – y
Thrice a number when increased by 5 gives 44. Find the number
A piece of wire is ‘12s’ cm long. What will be the length of the side, if it is formed as a square
The rectangles made of identical square blocks with varying lengths but having only two square blocks as width are given below
(i) How many small size squares are there in each of the rectangles P, Q, R and S?
(ii) Fill in the boxes
| Rectangle | P | Q | R | S | T |
| Number of small size squares along the breadth | 2 | 2 | ? | 2 | 2 |
| Number of squares along the length | 1 | 4 | 3 | ? | x |
| Total number of squares in rectangle | ? | 8 | ? | 10 | ? |
In the equation 2x = 4 – x, transposing – x to LHS, we get x = 4.
If 7x + 4 = 25, then the value of x is ______.
2x – 5 > 11 is an equation.
A class with p students has planned a picnic. Rs 50 per student is collected, out of which Rs 1800 is paid in advance for transport. How much money is left with them to spend on other items?
