1) Expand
(a) (x+4)²
(b) (2x-9)²
(c) (x-9)²
(d) (2x+5)(2x-5)
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Answer:
a) x²+16+8x
b)4x²+81-36x
c) x²+81-18x
d) (2x)²- (5)² = 4x²-25
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