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andrew-mc [135]
3 years ago
9

When the square of a certain number is diminished by 9 times the number the result is 36?

Mathematics
1 answer:
ArbitrLikvidat [17]3 years ago
3 0
X²-9x=36
minus 36 both sides
x²-9x-36=0
what 2 numbers multiply to -36 and add to -9
-12 and 3
(x-12)(x+3)=0
set to zero
x-12=0
x=12

x+3=0
x=-3



the number is either -3 or 12
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