Question

Evaluate: (4 0 – 9 0 ) × (4 0 + 9 0 )

Answer 1

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(40 - 90) × (40 + 90)

(- 50) × (130)

- 6500

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Answer 2

Step-by-step explanation:

(40-90)(40+90)

(40)2-(90)2

1600-8100

-6500