Question 902212
{{{25g^2 + 49h^2 - 70gh -12kp -9k^2 -4p^2=(25g^2 -70h+ 49h^2)-(9k^2+12kp+4p^2)}}}
{{{25g^2 + 49h^2 - 70gh -12kp -9k^2 -4p^2=(5g-7h)^2-(3k+2p)^2}}}