Question

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Answer 1

Answer:

1

Step-by-step explanation:

1) x² + (8 - 10) x- 8 x 10

= x² - 2x - 80

2) (3x+4)(3x-5)

3(3−5)+4(3−5)

9²−15+4(3−5)

9x²-15x+12x-20

= 9x²-3x-20

3) (3-2x)(3+2x)

(3²-2x²)

= 9-4x²