Question

Q15. Find the cube of 42 without multiplication.​

Answer 1

Answer:

74088

Step-by-step explanation:

$(42)^3 = (40 + 2)^3 = (40)^3 + (2)^3 + 3(40)(2)(40+2) = 64000+8+10080=74088$

Answer 2

Answer:

1764

Step-by-step explanation:

42²

42 × 42

(40+2)×(40+2)

40×(40+2)+2(40+2)

40×40+(40×2)+(2×40)+2×2

1600+80+80+4

1764

hope this helps you