对于形如$x^2 + (a + b)x + ab$的多项式,可以利用十字相乘法,将其分解为$(x + a)(x + b)$。例如,$x^2 + 5x + 6$可以分解为$(x + 2)(x + 3)$。 3.3 十字相乘法 十字相乘法是一种特殊的因式分解方法,适用于二次多项式。其关键在于找到两个数,它们的和等于多项式...
百度试题 结果1 题目Factorise: 2x^3-5x^2-19x+42 相关知识点: 试题来源: 解析 (x-2)(2x-7)(x+3)反馈 收藏
such that a + b =5 and ab = 6. on solving this we obtain, a = 3 and b = 2 thus, the above expression can be written as: x 2 + 3x + 2x + 6 = x(x + 3) + 2(x + 3) = (x + 3)(x + 2) thus, x+3 and x+2 are the factors of the polynomial x 2 + 5x + ...
(ii) Factorise 2x^4+5x^3-8x^2-8x+3 completely. 相关知识点: 试题来源: 解析 http://gallery.fbcontent.cn/latex?decode=false&latex=%24%24%5Cleft(x%5E%7B2%7D%2B3%20x-1%5Cright)(2%20x-3)(x%2B1)%24%24%25&fontSize=28 反馈 收藏 ...
Factor the given polynomial: 27a^2 - 30a - 8 Factor the given polynomial: xy - 5x + y - 15 Factor the given polynomial: 9x^3 - 24x^2 + 16x Factor the given polynomial: xy + 2x + y + 2 Factor the given polynomial completely: 10t^2 + 29t - 21 ...
2(b)(i)( 5 x - 4)(3 x + 2 )oe final answer 2(b)(i)4/5oeand-2/3oe 2(b)(i) B1 for (ax +b)(cx +d) where either ac = 15 and bd =-8 or ad + bc =-2 or 5x(3x+ 2)-4(3x+2) or 3x(5x-4)+ 2(5x-4) or correct factors seen and spoiled FT a fac...
a level的数学.1.Simplify (x^3+7^x2+5x-28)/(x+4)2.Factorise completely x^3+5x^2-2x-243.Make r the subject of the formula 4.If ,find the value of y when x = 9 given that y = 24 when x = 4 .5.The probability that I oversleep on any given day is 1/10.If I ...
(a)f(11)= 2(11)^3- 17(11)² -58(11) + 33(subst.)Note: 2662- 2057- 638 + 33 earns M markORattempt at dividing 2x^3- 17x² - 58x+ 33by(x- 11).(b)2x²+5x2x²+5x- 3Note: The M1, A1marks above may possibly be obtained in (a) above.(x+3)(2x-1)(a)N...
【题目】C. Questions that require solutionsFactorise the following:(1) x^2-5x+6(2) 4x^2-5(3) 4x^2+8x-1 ;(4) 3t^2-4t-1 ;(5)2y2-4y+1;(6) 2x^2-10xy+9y^2(7) -x^2-xy+y^2 ;(8) 2x^2y^2+4xy-3(9) -y^2x-4x^2y+2x^3(10) (x^3+x)^2-2x(x+1)-3 ...
1A non-monic quadratic such as 2x2-5x+ I can be factorised in the following way.2x^2-5x+1=2(x^2-5/2x+1/2) =2(x^2-5/2x+5/4)^2-(5/4)^2+1/2) Naec:5/2÷2=5/4 =2((x-5/4)^2-(25)/(16)+8/(16)) =2((x-5/4)^2-(17)/(16)) =2(x-5/4+(√(17)...