Question

(x+4)^2-(x-5)^2=9
plz give the answer quickly​

Answer 1

Answer:

1

Step-by-step explanation:

${x ^{2} + (4) ^{2} + 2 \times x \times 4 } - (x ^{2} + 25 - 2 \times x \times 5 = 9 \\ x ^{2} + 16 + 8x - x ^{2} - 25 + 10x = 9 \\ 18 x - 9 = 9 \\ 18x = 9 + 9 \\ x = 18 \div 18 \\ x = 1.$