Question 131746
a^2+b^2=c^2
x^2+15^2=(3x-7)^2
x^2+225=9x^2-42x+49
9x^2-x^2-42x+49-225=0
8x^2-42x-176=0
2(4x^2-21x-88)=0
2(4x+11)(x-8)=0
4x+11=0
4x=-11
x=-11/4
x=-2.75 answer.
x-8=0
x=8 answer.