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secondary 4 | E Maths
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Hi please help me with this question step-by-step in detail I’m really confused thank you so much :-)
Date Posted: 2 years ago
Views: 325
We can treat them largely like algebraic expressions.
(a + b) • (a - b)
= a • a + a • (-b) + b • a + b • (-b)
= |a|² - a • b + b • a - |b|²
= |a|² - a • b + a • b - |b|²
= |a|² - |b|²
Note that a • b = b • a and a • a = |a|².
(a + b) • (a - b)
= a • a + a • (-b) + b • a + b • (-b)
= |a|² - a • b + b • a - |b|²
= |a|² - a • b + a • b - |b|²
= |a|² - |b|²
Note that a • b = b • a and a • a = |a|².
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I hope this solution helps you
Date Posted:
2 years ago
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