# WK2HW - W K2HW JO Section 1.4 25 4a 12 a2-9 2a-10 = 4a 12...

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WK2HW – JO Section 1.4 25. 4a+12 ÷ a 2 -9 2a-10 a 2 -a-20 = 4a +12 * a 2 -a-20 2a-10 a 2 -9 = 4(a+3) * (a-5)(a+4) 2(a-5) (a+3)(a-3) = 4(a+4) 2(a-3) = 2(a+4) a-3 27. k 2 -k-6 * k 2 +3k-4 k 2 +k-12 k 2 +2k-3 = (k+2)(k-3 ) * (k+4)(k-1) (k+4)(k-3) (k+3)(k-1) = k+2 k+3 41. ___2____ + ___5____ 5(k-2) 4(k-2) = ____8____ + __ 25__ 20(k-2) 20(k-2)

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= 8+25 20(k-2) = __33__ 20(k-2) 49. 1 + 1/x = x(1+1/x) = x*1+x(1/x) = x+1 1-1/x x(1-1/x) x*1-x(1/x) x-1 51. 1/x+h - 1/x h = x-x-h/x(x+h) h = -h/x(x+h) h = -h/x(x-h) ÷ h = ___-h___ * ___1__ x(x+h) h = __-1___ x(x+h) Section 1.5 7. (3u 2 ) 3 (2u 3 ) 2 = (3 3 u 6 )(2 2 u 6 )=(27u 6 )(4u 6 )=108u 12 11. 2 -5 = 1/2 5 = 1/32
19. (4/3) -2 = 1/(4/3) 2 = 1/(4 2 /3 2 ) = 1 * 3 2 /4 2 = (3/4) 2 = 3 2 /4 2 = 9/16 21. (a/b 3 ) -1 = 1/(a/b 3 ) 1 = 1/(a/b 3 ) = 1 * b 3 /a = b 3 /a 33. 4 -2 /4 3 = 4 -2 * 4 -3 = 4 -5 1/4 5 92. ___2___ 1 + = ___2___ * 1 1 + = ___2___ * 1 + 1 + 1 + = 2(1 + ) (1) 2 – () 2 = 2(1 + ) 1-5 = 2(1 + ) -4 = -2(1 + ) = -2-2

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Section 1.6 13. m/2 – 1/m = 6m+5
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WK2HW - W K2HW JO Section 1.4 25 4a 12 a2-9 2a-10 = 4a 12...

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