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WyzAnt Tutoring Tutor Tutor United States

## Experienced, mature tutor-SAT, ACT, math through calc and French.

### North Palm Beach, FL (33408)

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# Robert's Responses in WyzAnt Answers

#### What is the positive value of X in the solution set of the equation

x^2+4X-36

I need help with thisssss

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Asked by Gerald from Naples, FL
00

This is not a factorable equation, thus you can solve it using either completion of the square or the quadratic formula.  Completion of the square is actually easier but many students are not skilled at this math.

x + 4x -36= 0           set the equation equal to zero

x+ 4x = 36           move the 36 to the right sige of the equation

x2  + 4x +4  =  36 + 4   add four to each side of the equation. 4 is equal to one half the x coefficient squared.  This makes the left side a perfect square and balance the equation by adding 4 to both sides.

(x + 2)2   =  40           Complete the square

x + 2  = ± (40)½   take the square root of both sides (note the ± symbol)

x = -2 ±    2(10)½

thus the positive answer is -2 + 2(10)½  or minus two plus 2 times the square root of 10

#### A square tile has a side 4 cm long. Use the appropriate formula model to find the area.

A square tile has a side 4 cm long. Use the appropriate formula model to find the area. What is the area of the square? Include units with your answer.

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Asked by Mystic from Republic, MO
00

A = S2

A = 4= 16 cm2

#### 3a to the 2nd power minus 2 a=5

3a to the second power minus 2 a=5

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Asked by Cierra from Palm Bay, FL
00

Don't forget completing the square, which is often easier and faster than the quadratic formula.

Sorry.  Somehow this was posted to the wrong question.

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## Background Check Status for Robert B.

Robert B. passed a background check on 10/16/2012. You may run an updated background check on Robert once you send an email.