MATH 110 Lecture Notes - Lecture 15: Negative Number, Factor 5, Greatest Common Divisor
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To factor means to find two or more quantities whose product equals the original quantity. To factor out a common factor,(1) find the largest common monomial factor of each term and (2) divide the original polynomial by this factor to obtain the second factor. Factor: 5 x2 + 4 x = x(5 x + 4, 2 y3 (cid:1679) 6 y = 2 y( y2 (cid:1679) 3, x5 (cid:1679) 4 x 3 + x2 = x2( x3 (cid:1679) 4 x + 1) When the common monomial factor is the last term, 1 is used as a place holder in the second factor. Factor: x2 (cid:1679) 144 = ( x + 12)( x (cid:1679) 12) Note: x2 + 144 is not factorable: a2 (cid:1679) b2 = ( a + b)( a (cid:1679) b, 9 y2 (cid:1679) 1 = (3 y + 1)(3 y (cid:1679) 1) Factoring polynomials having three terms of the form ax2 + bx + c.
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No common factor m^5 (20m^4 + 6m^2 +20) 2m^5 (10m^4 + 3m^2 +10) |
(0, 0) (0, 1) (1, 1) |
121p^2 + 88p - 16 121p^2 - 16 121p^2 - 88p -16 |
(7, -7) (9, -9) (-7, 7) |
(18x^2 - 2)(x - 5) (3x^2 - 2)(6x - 5) x(18x + 2)(x +5) |
x^2 + 8xy + 8y^2 x^2 + 8xy + 15y^2 x + 8xy + 15y |
54x^14 + 72x^9 54x^14 + 72x^9 -42x^7 54x^14 + 12x^2 -7 |
(15x - 2)(x + 4) (3x - 2)(5x + 4) (3x + 2)(5x -4) |
Trinomial, degree 3 Trinomial, degree18 Trinomial, degree11 |
12x^42 + 9 10x^26 - 2x^14 + 4x^12 +9 4x^8 + 4x^7 + 4x^6 +9 |
-3n^5 + 11n^3 - 3 5n^8 -3n^5 + 11n^3 -9 |
(-2, 4) (-1, 3) No solution |
(4, 1) (4, 0) No solution |
False |
False |
False |
False |
False |
False |
False |