Question

4.
(x + 4)2 - (x - 5)2 = 9
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Answer 1

${(x + 4)}^{2} - ( {x - 5)}^{2} = 9 \\ {x}^{2} + 8x + 16 - ( {x}^{2} + 25 - 10x) = 9 \\ \not{x}^{2} + 8x + 16 - \not{x}^{2} + 10x - 25 = 9 \\ 18x - 9 = 9 \\ 18x = 9 + 9 \\ 18x = 18 \\ x = \frac{18}{18} \\ \\ x = 1$

Answer 2

Step-by-step explanation:

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