factorise
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Given us
p² - 4pq + 4q² - r²
= { p² - 2.p.2q + ( 2q )² } - r²
= ( p - 2q )² - r²
= ( p - 2q - r ) ( p - 2q + r )
______________________________
formula used : ↓
a)→ ( a - b )² = a² - 2ab + b²
b) → a² - b² = ( a + b ) ( a - b )
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