exam Maths Puzzle Numerical Ability

Solve:

x^2+10*x+21=0

thanks a lot
matt

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FOIL
(6a+5t)(6a-5t)
this is my answer is it correct?
36a^2+60at-25t^2
The sum of the squares of two consecutive positive integers is 85. Find both integers. Im not how 2 set up the problem