Advertisements
Advertisements
Question
Find the product, using suitable properties:
(− 17) × (− 29)
Advertisements
Solution
(−17) × (−29)
= (−17) × [−30 + 1]
= [(−17) × (−30)] + [(−17) × 1] a × (b + c) = (a × b) + (a × c)
= [510] + [−17] = 493
RELATED QUESTIONS
A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour. What will be the room temperature 10 hours after the process begins?
In a class test containing 10 questions, 5 marks are awarded for every correct answer and (− 2) marks are awarded for every incorrect answer and 0 for questions not attempted.
Mohan gets four correct and six incorrect answers. What is his score?
Find the following products: (– 20) × (– 2) × (– 5) × 7
Find 16 × 12.
Find (– 35) × (– 98).
Find 52 × (– 8) + (–52) × 2
If * is an operation such that for integers a and b we have a * b = a × b + (a × a + b × b) then find (–6) * 2
If Δ is an operation such that for integers a and b we have a Δ b = a × b – 2 × a × b + b × b (–a) × b + b × b then find 4 Δ (–3) Also show that 4 ∆ (–3) ≠ (–3) ∆ 4.
In a true-false test containing 50 questions, a student is to be awarded 2 marks for every correct answer and –2 for every incorrect answer and 0 for not supplying any answer. If Yash secured 94 marks in a test, what are the possibilities of his marking correct or wrong answer?
A multistorey building has 25 floors above the ground level each of height 5 m. It also has 3 floors in the basement each of height 5 m. A lift in building moves at a rate of 1 m/s. If a man starts from 50 m above the ground, how long will it take him to reach at 2nd floor of basement?
