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McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
10. Roots and Zeros
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Exercise 62 Page 79

Begin by drawing a diagram that represents the situation. To find the length of the support, consider the Pythagorean Theorem.

About 6.93 feet

Practice makes perfect

Let's draw a diagram that represents the situation.

Let s be the length of the support. Using the Pythagorean Theorem, we can find the its length.

s^2+4^2=8^2
â–¼
Evaluate
CalcPow

Calculate power

s^2+16=64
SubEqn

LHS-16=RHS-16

s^2=48
SqrtEqn

sqrt(LHS)=sqrt(RHS)

s=± sqrt(48)
CalcRoot

Calculate root

s=± 6.92820...
RoundDec

Round to 2 decimal place(s)

s≈ ± 6.93

Because s is a measurement, it cannot be negative. Therefore, the length of the support is about 6.93 feet.

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