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Algebraic Identities (a-b)³

Question 1iii...

Question

Question 1(iii)
Multiply the binomials:
(2.5l-0.5m) and ( 2.5l+0.5m)

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Solution

$(2.5 l - 0.5 m) \times (2.5 l + 0.5 m) = 2.5 l \times (2.5 l + 0.5 m) - 0.5 m \times (2.5 l + 0.5 m)$
$= 2.5 l \times 2.5 l + 2.5 l \times 0.5 m - 0.5 m \times 2.5 l - 0.5 m \times 0.5 m$ $= 6.25 l^{2} + 1.25 l m - 1.25 l m - 0.25 m^{2}$
$= 6.25 l^{2} - 0.25 m^{2}$

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Algebraic Identities (a-b)³

Standard VIII Mathematics

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