Qstnid -A-5- Find The Cubes Of : (I) -3 (Ii) -7 (Iii) -12 (Iv) -18 (V) -25 (Vi) -30 (Vii) -50 - 04: Cubes And Cube Roots Class 8 Maths - Icse-viii-mathematics

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ICSE-VIII-Mathematics

04: Cubes and Cube Roots Class 8 Maths

with Solutions -

Qstn# A-5 Prvs-Qstn Next-Qstn

#5
find the cubes of : (i) -3 (ii) -7 (iii) -12 (iv) -18 (v) -25 (vi) -30 (vii) -50
Ans : (i) -3= (-3)³= -3 × -3 × -3
= -(3 × 3 × 3)= -27 (ii) -7= (-7)= -7 × -7 × -7
= -(7 × 7 × 7)= -343 (iii) -12= (-12)³= -12 × -12 × -12
= -(12 × 12 ×12)= -1728 (iv) -18= (-18)³= -18 × -18 × -18
= -(18 × 18 × 18)= -5832 (v) -25= (-25)³= -25 × -25 × -25
= -(25 × 25 × 25)= -15625 (vi) -30= (-30)³= -30 × -30 × -30
= -(30 × 30 × 30)= -27000 (vii) -50= (-50)³= -50 × -50 × -50
= -(50 × 50 × 50)= -125000

#5-i
-3
Ans : -3= (-3)³= -3 × -3 × -3
= -(3 × 3 × 3)= -27

#5-ii
-7
Ans : -7= (-7)= -7 × -7 × -7
= -(7 × 7 × 7)= -343

#5-iii
-12
Ans : -12= (-12)³= -12 × -12 × -12
= -(12 × 12 ×12)= -1728

#5-iv
-18
Ans : -18= (-18)³= -18 × -18 × -18
= -(18 × 18 × 18)= -5832

#5-v
-25
Ans : -25= (-25)³= -25 × -25 × -25
= -(25 × 25 × 25)= -15625

#5-vi
-30
Ans : -30= (-30)³= -30 × -30 × -30
= -(30 × 30 × 30)= -27000

#5-vii
-50
Ans : -50= (-50)³= -50 × -50 × -50
= -(50 × 50 × 50)= -125000