Can someone explain to me how to transform this equation to determine if its an identity (8x+12y)^2+(6x+9y)=(10x+15y)^2

Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Hello can you me find all the products