Question

Expand (_2a+5b+_3c)² by using suitable identities ​

Answer 1

Step-by-step explanation:

you will use the identity (a + b +c )² where a = -2, b = 5,

c = -3

Answer 2

Answer:

$(a+b+c)^2 \: = a^2 + b^2 + c^2 + 2ab + 2bc + 2ca$

$(2a + 5b + 3c) {}^{2} = (2a) {}^{2} + (5b) {}^{2} + (3c) {}^{2} + 2(2a)(5b) + 2(5b)(3c) + 2(3c)(2a)$

$( 2a + 5b + 3c) {}^{2} = 4a {}^{2} + 25b {}^{2} + 9c {}^{2} + 20ab + 30bc + 12ca$

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