exam Maths Puzzle Numerical Ability

The problem is number 23 on page 634. Problem is
(radical 3 - radical 2)(2 radical 2 + radical 3) . I am not understanding how to do this.

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exam Other Question

Smith bicycled 45 miles going east from Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than smith, and his trip took ½ hour longer than Smith’s. How fas The distance traveled by a ball rolling down a ramp is given by s(t)=3.5t^2, where t is the time in seconds after the ball is released, and s(t) is measured in feet.

a. Find th