Question 69

The value of $$151^2 - 149^2$$ is:

Solution

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$$151^2 - 149^2$$

= $$(149 + 2)^2 - 149^2$$

= $$149^2 + 2^2 + 2 \times 2 \times 149 - 149^2$$

= 4 + 596 = 600

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