factorise followings:- x²-81
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Answer:
x=9
x=-9
Step-by-step explanation:
using the quadratic formulae
-b+-√b²-4ac/2a
-0+-√0²-4(1)(-81)/2(1)
+-√324/2
+18/2
-18/2
x= 9
x= -9
Verified answer
Answer:
hello
Step-by-step explanation:
[tex] \\ {x}^{2 } - 81 \\ {x}^{2} - {9}^{2} = > by \: squaring \: 81 \\ \\ (x - 9)(x + 9) = > by \: ({ {a}^{2} - {b}^{2} }^{} ) \: by \: formula \\ \\ = >x = 9 \: \: \: \: x = - 9[/tex]
therefore the factors are 9 & -9
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