book Maths Puzzle Numerical Ability

Could someone help me with this one also please?
Solve for x without using decimals:

(2x + 3)^2 - (x - 2)^2 = 3

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book Other Question

A coffee wholesaler blends together three types of coffee that sell for $1.95, $2.10, and $2.25 per pound so as to obtain 100 pounds of coffee worth $2.13 per pound. If the wholes Dorothy is 3 times as old as her sister. In 5 years she will be twice as old as her sister. How old are Dorothy and her sister now?