Question

(x + 4) ^2- (x - 5)^2 = 9​

Answer 1

Answer:

use algebraic formulas

Answer 2

(a+b)²-(a-b)²

a²+b²+2ab-(a²+b²-2ab)=9

x²+16+8x-(x²+25+10x(mean:-2*x*-5)=9

= x²+16+8x-x²-25-10x=9

= 16+8x-10x-25=9

=16-2x-25=9

=-2x-9=9

= -2x=18

= x= -9 ans..is it correct??