Calling all mathematicians !! I really need help on these maths problems!?

1) x^2=8+7x (x-8)(x+1)=0 x=8 2) x^2+(x+1)^2=25 x^2+x^2+2x+1=25 x^2+x-12=0 (x+4)(x-3)= 0 x=3 x+1=4 3) x^3=(x+1)^3-61 x^3=x^3+3x^2+3x+1-61 x^2+x-20=0 (x+5)(x-4)=0 x=4 x+1=5