Question

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Answer 1

3*x+3*5-5(1-x^2)=x^2+6x+9+4x^2-4x+1+13

3x+15-5+5x^2=5x^2+2x+23

3x+10+5x^2=5x^2+2x+23

5x^2-5x^2+3x-2x=23-10

0+x=13

x=13

(A+B)(A-B)=A^2-B^2

(A+B)^2=A^2+2AB+B^2

(A-B)^2=A^2-2AB+B^2