Question

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Find the mistake
a) (x+3)(x+9)= x2+18x+12

Answer 1

Explanation:

Using FOIL:

(x + 3)(x + 9)

= (x)(x) + (x)(9) + (3)(x) + (3)(9)

= x² + 9x + 3x + 27

= x² + 12x + 27.