Question

Factorise 4a² +20ab +25b²

Answer 1

4a² +20ab +25b²

(2a)² +2.2a.5b +(5b)²

(2a+5b)²

(2a+5b)(2a+5b)

Answer 2

H€YA!!
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➡FACTORISATION ⬅
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$= > > 4a {}^{2} + 20ab \: + 25b {}^{2} \\ \\ = > > (2a) {}^{2} + 2 \times 2 \times 5 \times ab + (5b) {}^{2} \\ \\ \\ > > a = 2a \: \: and \: \: b = 5b \\ \\ \\ = > > (2a + 5b) {}^{2} = (2a + 5b)(2a + 5b)$
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