book Maths Puzzle Numerical Ability

Use the difference-of-squares patterns to factor f the following.

(x+6)^2-(x+9)^2

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book Other Question

A car traveled 28 miles in 30 minutes. How many miles per hour was is traveling? If a and b are the roots of the equation x + 1 = tx(1-tx) and if t1 and t2 are two values of t determined from the relation a/b + b/a = r-2, show that t1sq./t2sq.+ t2sq./t1sq.+ 2 =