Question 3(iii)
Find the following squares by using identities:
$(6 x^{2} - 5 y)^{2}$

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Solution

$(6 x^{2} - 5 y)^{2} = (6 x^{2})^{2} - 2 \times 6 x^{2} \times 5 y + (5 y)^{2}$ $[U s i n g i d e n t i t y (a - b)^{2} = a^{2} - 2 a b + b^{2}]$ $= 36 x^{4} - 60 x^{2} y + 25 y^{2}$

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Question 3(iii)
Find the following squares by using identities:
$(6 x^{2} - 5 y)^{2}$

(2 x y + 5 y)^{2}

(2 x y + 5 y)^{2}

{(6 x^{2} - 5 y)}^{2}

(x y + 3 z)^{2}

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