week 7 chkpoint solution

week 7 chkpoint solution - 1. Solve 2x 2 =6. Find the x...

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Unformatted text preview: 1. Solve 2x 2 =6. Find the x intercepts of f(x) = 2x 2-6 x 2. Need exact and approx solutions. (x-8) 2 =25 3. Need exact and possible solutions. Y 2-10y+25=36 4. Solve X 2-16x=10 5. X 2 +6x-27=0 6. Solve x 2 +7x-7=0 and find the x intercepts of f(x)=x 2 7x-7 7. If a b ball player has a vertical leap of about 25 inches, what is his hang time? Use the hang time function of v-48 t 2 Given: V=48t, V = 25 25 = 48t 25/48 = t (25/48) = t 0.72168 sec = t 8. X 2 +12x+4=0 x^2+12x+4=0 x=[-12+-sqrt(144-16)]/2=[-12+-sqrt(128 8*sqrt2]/2=-6+-4sqrt2 x1=-6+4sqrt2 x2=-6-4sqrt2 9. R 2 +3r=3 10. Solve 3x 2-5x-13=0 and find x intercepts of f(x)=3x 2-5x-13 3x^2 - 5x - 13 = 0 3x^2 - 5x = 13 x^2 - (5/3)x = 13/3 x^2 - (5/3)x + 25/36 = 13/3 + 25/36 (x - 5/6)^2 = 161/36 x - 5/6 = 161/6 x = (5 161)/6 The x-intercepts of f(x) = 3x^2 - 5x - 13 are (5 161)/6. 11. 2(x-4)-(X+2)=(X+2)(X-4) (x+2)(x-4)-2(x-4)=-(x+2) (x-4)[(x+2)-2]=-(x+2) (x-4)x=-(x+2) x^2-4x+x+2=0 x^2-3x+2=0=>(x-2)(x-1)=0 =>x1=2 =>x2=1...
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This note was uploaded on 12/30/2010 for the course DSA 12 taught by Professor Jhonecaine during the Winter '10 term at Aberystwyth University.

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week 7 chkpoint solution - 1. Solve 2x 2 =6. Find the x...

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