dum hai to btao answer
17) . Simplify: (x+3)(x-3) (x+4)(x-4)
fastly in 2 min.
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(x+3)(x-3) (x+4)(x-4)
= (x²-3²) (x²-4²)
= (x²-9)(x²-16)
=x⁴-16x²-9x²+144
=x⁴-25x²+144
= (x²-3²) (x²-4²)
= (x²-9)(x²-16)
=x⁴-16x²-9x²+144
=x⁴-25x²+144
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