Advertisements
Advertisements
Question
Verify the following: 18 × [9 + (−7)] = 18 × 9 + 18 × (−7)
Advertisements
Solution
L.H.S.
=18 × [9 + (–7)]
= 18 × [9 – 7]
= 18 × 2
= 36
R.H.S.
=18 × 9 + 18 × (–7)
= 162 – (18 × 7)
= 162 – 126
= 36
∴ L.H.S = R.H.S
Hence, verified.
APPEARS IN
RELATED QUESTIONS
State, true or false of the given statement:
a x (b + c) = a x b + c
Indicate the following using '+' or '−' sign: 3 km below sea level
Fill in the blanks:
2 + (−12) = .......
Add: -103 and 312
Subtract: −15 from 25
Find the product: 2 × (−5) × (−6)
Verify the following: (−13) × [(−6) + (−19)] = (−13) × (−6) + (−13) × (−19)
An atom changes to a charged particle called ion if it loses or gains electrons. The charge on an ion is the charge on electrons plus charge on protons. Now, write the missing information in the table given below:
| Name of Ion | Proton Charge | Electron Charge | Ion Charge |
| Hydroxide ion | +9 | – | –1 |
| Sodium ion | +11 | – | +1 |
| Aluminium ion | +13 | –10 | – |
| Oxide ion | +8 | –10 | – |
Height of a place A is 1800 m above sea level. Another place B is 700 m below sea level. What is the difference between the levels of these two places?
Choose the correct order from smallest to greatest:
