x² - 15 - 2x = 0 Arrange the left side in descending order of eponents of x: We need to factor the left side: Give the x² the coefficient of 1 1x² - 2x -15 = 0 Multiply the red 1 by the blue 15, getting 15. Now think of a pair of positive integers whose product is …

2015年10月17日 · Factor y = 15x^2 - 2x - 8 Ans: y = (3x + 2)(5x - 4). I use the new AC Method to factor trinomials (Socratic Search). y = 15x^2 - 2x - 8 = 15(x + p) (x + q) Converted y' = x^2 - 2x - 120 = (x + p')(x + q'). p' and q' have opposite signs.

2018年4月12日 · x=-5" or "x=3 >"the factors of - 15 which sum to + 2 are + 5 and - 3" rArr(x+5)(x-3)=0 "equate each factor to zero and solve for x" x+5=0rArrx=-5 x-3=0rArrx=3

x(x+1) is WRONG! It means a function x of x-1. x*(x-1) is right. Use the ^ (caret) for exponentiation. x^2 means x squared. x/2y means Resources: Simplifier Portal, help with entering simplifier formulas (a must read).

2016年6月16日 · 15x^2-x-2=(3x+1)(5x-2) To factorize 15x^2-x-2 by grouping, we have to first split coefficient of middle term -1 in two parts so that their product is the product of coefficient of other two i.e. 15xx(-2)=-30.

2016年6月26日 · 15x^2-x-2=(3x+1)(5x-2) To factorize a quadratic polynomial ax^2+bx+c, if the discriminant b^2-4ac is a square f a rational number, then one can factorize it by splitting b in two parts whose product is ac.

2017年1月3日 · x^2+25x+150=(x+10)(x+15) We want to look for two numbers. These numbers should have a product of color ...

2018年4月18日 · #15x^2+6x# = #3(5x^2+2x)# And finally we can pullout one x, since both terms have at least one: #3(5x^2+2x)# = #3x(5x+2)# We can test are answer by multiplying the #3x# by both terms in the parentheses, and seeing if we get our original expression: #3x(5x+2)# = #3x*5x + 3x*2# = #15x^2 +6x# So, #3x(5x+2)# is correct.

2015年8月5日 · Factor y = 15x^2 - 19x + 6 Ans: (5x - 3)(3x - 2) y = 15x^2 - 19x + 6 = 15(x - p)(x - q). I use the new AC Method (Yahoo, Google Search) Converted trinomial y' = x^2 ...

2018年5月21日 · x=-3 or x =-5 Multiply everything by x^2 to remove the fractions. x^2xx8/x +x^2xx15/x^2=x^2xx-1 (8x^2)/x +(15x^2)/x^2=-x^2 8x+15=-x^2 Add x^2 to both sides x^2+8x+15=0 Factorise (x +3)(x +5)=0 x +3=0 or x +5=0 x=-3 or x=-5