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For Any Two Vectors → a and → B Show that ( → a + → B ) ⋅ ( → a − → B ) = 0 ⇔ | → a | = ∣ ∣ → B ∣ ∣ - CBSE (Arts) Class 12 - Mathematics

ConceptBasic Concepts of Vector Algebra

Question

For any two vectors $\vec{a} \text{ and } \vec{b}$ show that $\left( \vec{a} + \vec{b} \right) \cdot \left( \vec{a} - \vec{b} \right) = 0 \Leftrightarrow \left| \vec{a} \right| = \left| \vec{b} \right|$

Solution

$\text{ We have }$
$\left( \vec{a} + \vec{b} \right) . \left( \vec{a} - \vec{b} \right) = 0$
$\Rightarrow \left| \vec{a} \right|^2 - \left| \vec{b} \right|^2 = 0$
$\Rightarrow \left| \vec{a} \right|^2 = \left| \vec{b} \right|^2$
$\Rightarrow \left| \vec{a} \right| = \left| \vec{b} \right|$

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Solution For Any Two Vectors → a and → B Show that ( → a + → B ) ⋅ ( → a − → B ) = 0 ⇔ | → a | = ∣ ∣ → B ∣ ∣ Concept: Basic Concepts of Vector Algebra.
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