Question

$expand \: (5p - 1)^2$
$expand \: (2a + 5)^3$
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Answer 1

Answer:

25p2+1+10p

8a3+125+30a(2a+5)

Explanation:

Plz do the last step of second bit.

Answer 2

Explanation:

$1). (a+b) = a^{2} + 2 (a) (b) + b^{2} \\= (5p)^{2} + 2 (5p) (1) + (1)^{2} \\ =25p^{2} + 10p + 1$

$2). (a+b)^{3} = a^{3} + b^{3} + 3ab(a+b) \\ = (2a)^{3} + (5)^{3} + 3(2a)(5)[2a + 5]\\ = 8a^{3} + 125 + 3(10a)(2a+5)\\ = 8a^{3} + 125 + 3 ( 20a^{2} + 50a )\\ = 8a^{3} +125+60a^{2} + 150a \\ = 8a^{3} + 60a^{2} + 150a + 125$