Question

7. Find the cube-roots of :
(i) 700 x 2 x 49 x 5
(ii) -216 x 1728
(iii) -64 x -125
(iv) -27/343
(v)729/-1331
(vi) 250.047
(vii) -175616​

Answer 1

Step-by-step explanation:

i) 700×2×49×5

= (2×2×5×5×7)×2×(7×7)×5

= 2×2×2×5×5×5×7×7×7

= (2×5×7)³

= (70)³

ii) (-216)×1728

= (-6)³×(12)³

= (-72)³

iii) (-64)×(-125)

= (-4)³×(-5)³

= (20)³

iv) -27/343

= (-3)³×(7)³

= (-21)³

v) 729/(-1331)

= (9)³/(-11)³

= (-9/11)³

vi) 250.047

= (250047/1000)

= (63/10)³

=(6.3)³

vii) -175616

= (-56)³

Answer 2

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