Find $(0.4 p - 0.5 q)^{2}$ [3 MARKS]

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Solution

Steps : 2 Marks each
Result : 1 Mark

$(0.4 p - 0.5 q)^{2}$

$= (0.4 p - 0.5 q) \times (0.4 p - 0.5 q)$

$= (0.4 p) \times (0.4 p) - (0.4 p \times 0.5 q + 0.4 p \times 0.5 q) + (0.5 q) \times (0.5 q)$

$= 0.16 p^{2} - 0.40 p q + 0.25 q^{2}$

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Find $(0.4 p - 0.5 q)^{2}$ . If p = 5 and q = 4, evaluate the value of the expression. [3 MARKS]

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Question 3(v)
Find the following squares by using identities:
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