Determine if the two triangles are congruent

What are the soultion(s) to the quadratic equation 40- x^2=0

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Solve the equation by completing the square. x^2+2x=17