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Ex 14.2, 1 (vii) - Factorise (l + m)^2 - 4lm (Hint: Expand (l+m)^2

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Ex 14.2, 1 Factorise the following expressions. (vii) 〖"(l + m)" 〗^2 – 4lm (Hint: Expand 〖"(l + m)" 〗^2 first) 〖"(l + m)" 〗^2 – 4lm Using (𝑎+𝑏^2 )=𝑎^2+𝑏^2+2𝑎𝑏 Here, 𝑎 = l and b = m Using (𝑎+𝑏^2 )=𝑎^2+𝑏^2+2𝑎𝑏 Here, 𝑎 = l and b = m Using (𝑎−𝑏^2 )=𝑎^2+𝑏^2−2𝑎𝑏 Here, 𝑎 = l and b = m = (𝒍−𝒎)^𝟐

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