1.

The area of parallelogram formed by vectors, i+4j and 37x4) as adjacent sides is:(1) 19 units (2) S units(3) 16 units (4) of theseode A I Page 4

Answer»

Area of parallelogram is cross products of sides

= |A×B| = |(i+4j)×(3i+4j)| = |(4-12)k|= 8k

and modulus is = 8 units

option 2

its not 3i+4j its 3i ×4j

Then first on resolving 3i×4j = 12k

so area will be | (i+4j)×(12k) |= = 48i +12j

and modulus = |√48²+12²| = 49.47 units

option D is the ✓

so, there can be a printing error.. it should be 3i+4j



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