Solve for the x equation: [(9) power of x] - [(3) power of x] - 8 = 0?

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Success in CBSE / ICSE Class 12 and 10 Mathematics Boards

(3power of x -2)to the power 3
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Evaluate the product without multiplying directly: 103 x 107?
103 x 107 = (100 + 3)(100 + 7) We know that (x + a)(x + b) = x^2 + (a + b)x + ab Therefore, 103 x 107 = 100^2 + (3 + 7) x 100 + 3 x 7 = 10000 + 1000 + 21 = 11021
Shubham
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What is the formula for Harmonic mean?
Harmonic Mean of 'a' & 'b' is = 2ab / ( a+b )
Himangi
If m and n are odd positive integers, then m2 + n2 is even, but not divisible by 4. Justify.
Since m is odd positive integer then we can write m=2a+1 and n=2b+1, such that a,b >0 m2+n2=(2a+1)^2+(2b+1)^2 = 4a^2+1+4a+4b^2+1+4b = 4a^2+4b^2+4a+4b+2 = 2(2a^2+2b^2+2a+2b+1) Above eqn is divisible by 2 but not divisible by 4.
Sweetu
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How can I score good percentage in my class 10 CBSE boards exam?
Do regular study and stay focused. Read and revised theory and numerical at regular intervals. Work hard on the weak subject and if required take tuition of that subject. NCERT books reading is very important...
Sharmistha
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Mathematics average
Que : Average of 5 consecutive even numbers is 12 . Find the sum of 1st and last numbers. Sol : shortcut... If consecutive numbers average is given, then average is (1st + last)/2 = 12 Therefore sum of 1st and last = 12*2 = 24

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