course Mth 158
Question:* 1.2.13 \ 5. Explain, step by step, how you solved the equation z^2 - z - 6 = 0 using factoring.
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Your solution:
I factored out (z-3) and (z+2) and got z=3 and z= -2
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Question: * 1.2.14 (was 1.3.6). Explain how you solved the equation v^2+7v+6=0 by factoring.
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Your solution:
V=-1and v=-6
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Question:
* 1.2.20 (was 1.3.12). Explain how you solved the equation x(x+4)=12 by factoring.
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Your solution:
I distributed then I factored out x-2 and x+6 and got x=2and x=-6
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Question:
* 1.2.26 \ 38 (was 1.3.18). Explain how you solved the equation x + 12/x = 7 by factoring.
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Your solution:
I subtracted 7 and then I multiplied it all by x then I factored out x-3 and x-4 and got x=3 and x=4
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Question:
* 1.2.32 (was 1.3.24). Explain how you solved the equation (x+2)^2 = 1 by the square root method.
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Your solution:
I foiled and then subtracted 1 and then factored and got x+3 and x+1 and got x=3and x=4
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Question:
* 1.2.44 (was 1.3.36). Explain how you solved the equation x^2 + 2/3 x - 1/3 = 0 by completing the square.
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Your solution:
I multiplied each side by 3 and then I factored and got 3x-1 and x+1and x=1/3 and x=-1
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Question:
* 1.2.50 \ 52 (was 1.3.42). Explain how you solved the equation x^2 + 6x + 1 = 0 using the quadratic formula.
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Your solution:
X aprox= -.17 or -5.83
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Question:
* 1.2.78 \ 72 (was 1.3.66). Explain how you solved the equation pi x^2 + 15 sqrt(2) x + 20 = 0 using the quadratic formula and your calculator.
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Your solution:
X aprox= -11.18 or -55.46
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Question:
* 1.2.106 \ 98 (was 1.3.90). Explain how you set up and solved an equation for the problem. Include your equation and the reasoning you used to develop the equation. Problem (note that this statement is for instructor reference; the full statement was in your text) box vol 4 ft^3 by cutting 1 ft sq from corners of rectangle the L/W = 2/1.
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Your solution:
Since w=0 makes no senshas to be 6be w=3 so the length e the awenser must
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Question:
* 1.2.108 \ 100 (was 1.3.96). Explain how you set up and solved an equation for the problem. Include your equation and the reasoning you used to develop the equation. Problem (note that this statement is for instructor reference; the full statement was in your text) s = -4.9 t^2 + 20 t; when 15 m high, when strike ground, when is ht 100 m.
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Your solution:
a) T= 3.09 sec
b) T=4.08u
c) No because you can’t take the square root of a negative #
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This is pretty much a repeat of my preceding note. I can't critique or comment further unless you complete the self-critique process (see my notes on previous submissions). However your explanations hold together and from what I see here you appear to be doing very well.