Question

Factorise — a² + 4ab + 4b²

Answer 1

Answer:

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Answer 2

${ - a}^{2} + 4ab + 4b^{2}$

Changing Signs

${a}^{2} - 4ab - 4b^{2}$

THEN FACTORISING,

using formula....

$( a - b)^{2} = a^{2} - 2ab + b^{2}$

WE GET....

$a {}^{2} - 2 \times a \times 2b + 2b {}^{2}$

a = a

b = 2b

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