Solve for x: x3+72=32
5
-5
-6
6
Given, x3+72=32
Transposing 72 to RHS, we get
⇒ x3=32−72
⇒ x3=−42 ⇒ x3=−2
Multiplying both sides by 3, we get
x=−6
Question 6
Which of the following expressions show that rational numbers are associative under multiplication. (a) 23×(−67×35)=(23×−67)×35 (b) 23×(−67×35)=23×(35×−67) (c) 23×(−67×35)=(35×23)×−67 (d) (23×−67)×35=(−67×23)×35
Add (i) (2√3−5√2) and (√3+2√2)
(ii) (2√2+5√3−7√5) and (3√3−√2+√5)
(iii) (23√7−12√2+6√11) and (13√7+32√2−√11)