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1i, We know (x−5)(x−5)=(x−5)
(x-5)^2 = (x)^2 -2 *x* 5 +(5)^2
= x^2 -10x +25
ii, (3a+8) (3a+8) = (3a+8)²
(3a+8)² = (3a)² + 2×3a×8 + 8² .
(3a+8)² = 9a⁴ + 48a + 64 .
iii, (a-b) ^2= a^+b^2-2ab
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