factorise:1-25x²
995²=(1000-5)²
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Answer:
(1+5x) (1-5x)
Step-by-step explanation:
1 - 25x^2
(1)^2 (5x)^2
(1 + 5x) (1 - 5x)
(995)^2
(100 - 5)^2
(100)^2 - 2×100×5 + (5)^2
10000 - 1000 + 25
9000 + 25
9025
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