Question
If $p = − 10$, evaluate:
$3p^2 – 20p$
$3p^2 – 20p$
✓
Answer
$3p^2 – 20p$
$= (3 \times p \times p) − (20 \times p)$
$= (3 \times (− 10) \times (− 10)) − (20 \times (− 10))$
$= 300 − (− 200)$
$= 300 + 200$
$= 500$
$= (3 \times p \times p) − (20 \times p)$
$= (3 \times (− 10) \times (− 10)) − (20 \times (− 10))$
$= 300 − (− 200)$
$= 300 + 200$
$= 500$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In a class test, the marks were awarded out of 80. Kamal obtained 65 % marks. How many marks did he get?
Air is an important inexhaustible natural resource. It is essential for the survival of human beings, microbes, plants, and animals. The following table shows the percentage of various gases in the air.
If a certain quantity (by volume) of air contains $4,200$ litres of oxygen, find the total quantity of air taken and the amount of nitrogen in it.
→| Contents of air | Percentage (by volume) |
| Nitrogen | $78$ |
| Oxygen | $21$ |
| Other (carbon dioxide, inert gases, water vapours, etc.) | $1$ |
If a certain quantity (by volume) of air contains $4,200$ litres of oxygen, find the total quantity of air taken and the amount of nitrogen in it.
See the following pattern carefully:
i. If $n$ denotes the number of figures and $S$ denotes the number of matches; find $S$ in terms of $n$.
ii. Find how many matches are required to make the :
(1) 15 th figure
(2) 40th figure
iii. Write a discretion of the pattern in words.
→i. If $n$ denotes the number of figures and $S$ denotes the number of matches; find $S$ in terms of $n$.
ii. Find how many matches are required to make the :
(1) 15 th figure
(2) 40th figure
iii. Write a discretion of the pattern in words.
Simplify:
3x − [5y − {6y + 2 (10y − x)}]
3x − [5y − {6y + 2 (10y − x)}]
Find the difference :$4 \frac{1}{7}-2 \frac{1}{14}$
→Complete the following magic squares:
| 6 | 7 | _______ |
| _______ | 5 | 9 |
| 8 | _______ | 4 |
Subtract: $-x$ from $x$
→Insert the symbol ' $=$ ' or ' $>$ ' or '<' between the pair of fractions, given below:
$\frac{6}{11} \ldots \frac{5}{9}$
→$\frac{6}{11} \ldots \frac{5}{9}$
The salary of a man is $₹ 7,200$ per month, which is now increased by $8\%.$ Find his new salary per month.
→Solve the following equation: 3y – 8 = 13