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# Tutor profile: Odhori P.

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Odhori P.
Tutor for 3 years, Engineer in the Industry
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## Questions

### Subject:Pre-Calculus

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Question:

(x^4) - (13x^2) + 36 = 0

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Odhori P.

((x^2)^2) - 13(x^2) + 36 = 0 we can replace the x^2 with the letter u (u^2) - 13u + 36 = 0 factor: what can add together to equal -13, but multiply together to equal +36? -9 + -4 = -13 and -9 x -4 = +36 (u-9)(u-4) = 0 now solve for zero u-9 = 0, u-4 = 0 u = 9 or u = 4

### Subject:Basic Math

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Question:

-6 + 12

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Odhori P.

-6 which is -x, -x, -x, -x, -x, -x + + + + + + 12 which is x, x, x, x, x, x, x, x, x, x, x, x Add them together The negative cancels out the positive, so you are left with 6 which is x, x, x, x, x, x

### Subject:Calculus

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Question:

Find the derivative: (d/dx)(x^4)

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Odhori P.

move the exponent to the front and subtract 1 from that exponent to make the new exponent = 4(x^3)

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