Yep, i'm back again.
As pathetic as it may sound I am unable to factorise this equation. This mean put it into 2 bracets as in (x+1)(x-5).
Please help.
2007-07-19 09:05:42 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
-4x^2 - 19x + 63
= (x + 7)(-4x + 9)
2007-07-19 09:10:01 · answer #1 · answered by Mathematica 7 · 0⤊ 0⤋
Here is a step by step:
1) Multiply -4 (from -4x^2) by 63: -4 x 63 = -252
2) What factors of -252 add up to -19 (from 19x)
-28 x 9 = -252, -28 + 9 = -19
3) Write problem by breaking up -19x, lining them up by factors of first variable (4 is a factor of 28) and last constant
(9 is a factor of 63), (-4x^2 +9x -28x +63 will not work.)
-4x^2 -28x + 9x + 63
4) Factor front two numbers and last two numbers:
-4x(x+7) + 9 (x+7)
Note that you will always the same term in ( ).
5) Redistribute: (-4x+9)(x+7)
That is your answer.
This method will work for most problems with an x^2 coefficient larger than one.
2007-07-19 09:43:14 · answer #2 · answered by nasamike2001 2 · 0⤊ 0⤋
Factors of 63: 9, 7; 3, 21; 1, 63
Try 9 and 7:
(x + 7)(-4x + 9)
2007-07-19 09:09:56 · answer #3 · answered by yeeeehaw 5 · 0⤊ 0⤋
initiate by making use of observing the possibles - sixty 3 must be the two -9*-7 or 9*7. -4x² must be -x*4x,-2x*2x or -4x*x. -19 can in ordinary terms be -28+9. then you definitely placed the products mutually continuously examine what you recognize - then the respond is easy.
2016-12-14 13:53:00 · answer #4 · answered by jowers 4 · 0⤊ 0⤋
this one is a 3 bracer
(-1)(4x²+19x-63) Note the sign changes
(-1)(x+7)(4x-9) or
(x+7)(9-4x)
2007-07-19 09:15:48 · answer #5 · answered by 037 G 6 · 0⤊ 0⤋
y = -4x²-19x+63 (I also did this one on the other board for you.)
y = (-4x + 9)(x + 7)
2007-07-19 09:10:57 · answer #6 · answered by Reese 4 · 0⤊ 0⤋
(-4x^+9)(x+7) = -4x^2 - 28x + 9x + 63 = -4x^2 - 19x +63
2007-07-19 09:26:02 · answer #7 · answered by Ayana S. A-J 2 · 0⤊ 0⤋
y=-4x²-19x+63
y= (-4x+9)(x+7)
2007-07-19 09:25:24 · answer #8 · answered by ironduke8159 7 · 0⤊ 0⤋
- (4x² + 19 x - 63)
- (x + 7) (4x - 9)
If desired , may be written as:-
(x + 7) (9 - 4x)
2007-07-20 21:37:35 · answer #9 · answered by Como 7 · 0⤊ 0⤋
(x+7)(-4x+9)
2007-07-19 09:17:57 · answer #10 · answered by nazaryan97 2 · 0⤊ 0⤋