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Earn +20 ptsQ: Complete the square x2 plus 8x minus 5 equals 15?
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What is a square root of a square?
Plus or minus the base. If the base is X and you square it, you get X2. If you take the square root of that, you get Plus or Minus X. This is because X*X equals X2 and -X*-X also equals X2.
If sin2a plus cos2a equals 1 does sin2a minus cos2a equals 1 also ... 2 means square and a means alpha?
No. But sin2a equals 1 minus cos2a ... and ... cos2a equals 1 minus sin2a
How can you use subtraction to complete an addition problem?
Treat the "plus positive X" as "minus negative X". Example: Positive two plus positive two equals positive four. Positive two minus negative two equals positive four.
What is minus 8 plus 6?
Minus 8 plus 6 equals -2.
What is minus 8 times minus 3 plus minus 6 equals?
18
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