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secondary 3 | E Maths
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Date Posted: 4 years ago
Views: 462
(2x)² - (2y)² = 36
→
4x² - 4y² = 36
→
x² - y² = 9
→
(x+y)(x-y) = 9
→
(x-y) = 9÷(x+y) = 9÷2
→
(x-y)² = 81÷4 = 20¼ (Ans)
→
4x² - 4y² = 36
→
x² - y² = 9
→
(x+y)(x-y) = 9
→
(x-y) = 9÷(x+y) = 9÷2
→
(x-y)² = 81÷4 = 20¼ (Ans)
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