Formulas are used throughout real life applications-- the book gives an example of the formula for the total piston displacement of an auto engine... we discussed a number of formulas that students recalled such as the following:
A =lw
d = rt
I = Prt
A = ∏r2
A = P(1 + rt)
C = 5/9(F - 32)
y = mx + b
A = bh
C = ∏d
F = Ma
A = ½(b1b2h
E= mc2
A2 + B2 = C2
and even the quadratic formula-- which we will study later this year..
b = ax ; x
just divide both sides by a
b/a = x
Solve P = 2L + 2W for the width, w
P-2L = w
2
C = 5/9(F - 32) Solve for F
We need to multiply both sides by the reciprocal of 5/9
(9/5)C = F - 32
now add 32 to both sides
(9/5)C + 32 = F
Next we tackled
We also discussed the restrictions and found that the denominator could not equal zero.
S = v/r ( solving for r) became one of the homework problems that caused some discussion-- until students realized that they had actually found the reciprocal of r or 1/r instead of solving for r!!
We discussed how to solve that dilemma.
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