Factorise.
16p2 – 8pq - 25r2 + q2
a
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Answer:
{ 4p - q - 5r }²
Step-by-step explanation:
16p2 - 8pq - 25r2 + q2
= { 16p² - 8pq + q² } - 25r²
= { (4p)² - (2 × 4p × q) + (q)² } - 25r²
= { 4p - q }² - 25r²
= { 4p - q }² - { 5r }²
= { 4p - q - 5r }²
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