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## Math Tutor - Algebra, Trig, Calculus, SAT/ACT Math

### New York, NY (10027)

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# when solving for the proportion 3/x = x/3, why is the answer x=3, -3 and not just x=3? (answer)

If you cross-multiply, you get x2 = 9. There are now two ways to solve for x. Either: 1) Simply square root both sides. This leaves you with x = ±√9. Remember that when you are taking the square root while solving an equation, you must include both the positive and negative square roots. We...

# solve the equation 11=y-9 (answer)

To solve this equation, we need to get y alone on one side of the equal sign. To do this, we need to move the - 9 over to the left side. This means adding 9 to both sides of the equation.   11 = y - 9 + 9      + 9   20 = y - 9 + 9 The - 9 and + 9 cancel out to 0, so we get 20 = y...

# degree of algebraic terms (answer)

The polynomial you gave has two terms: the first is x3y2, and the second is -30x4. Using the definition you gave, the degree of the first term, x3y2, is 3 + 2 = 5, while the degree of the second term, -30x4, is 4. Therefore, the degree of the entire polynomial is 5. The definition says that...

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