Question

solve x: (9+x)(9-x)=17​

Answer 1

Answer:

x= +8

Step-by-step explanation:

(a+b)(a-b)=a²-b²

(9+x)(9-x)=9²-x²=17

81-x²=17

x²=81-17=64

x=+8

Answer 2

$(9 + x)(9 - x) = 17 \\ therefore(a + b)(a - b) = {a}^{2} + {b}^{2} \\ {9}^{2} + {x}^{2} = 17 \\ 81 + {x}^{2} = 17 \\ {x}^{2} = 17 - 81 \\ {x}^{2} = - 64 \\ x = 8$

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