Question

(x+4)square - (x-5)square = 9

Answer 1

Answer:

X=1

Step-by-step explanation:

${a}^{2} - {b }^{2} = (a + b)(a - b)$

Answer 2

Answer:

x²+ 4²+2×4 x-(x²+5²-2x5)=9

16+8x-25+10x=9

-9+18=9

18=18

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