2007-08-17 09:22:52 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
= 28 x ² - 12 x + 28 x - 12
= 28 x ² + 16 x - 12
2007-08-17 10:37:12 · answer #1 · answered by Como 7 · 2⤊ 0⤋
4x times 7x + 4x times -3 + 4 times 7x + 4 times 3 =
28x^2+16x-12
or simplified further
(28x^2+16x-12) /4 = 7x^2+4x-3
2007-08-17 09:40:19 · answer #2 · answered by Pliny 3 · 0⤊ 0⤋
expand
(4x + 4) (7x - 3)
28x^2 - 12x + 28x - 12
28x^2 + 16x -12
solve for x
(4x + 4)
4x = -4
x= -4/4
x= -1
and/or
(7x - 3)
7x=3
x= 3/7
replacing x to find the correct answer
A. (4x + 4) (7x - 3) = 0
[4(-1) + 4] [7(-1) - 3] = 0
[0] [-10] = 0
correct
B. (4x + 4) (7x - 3) = 0
[4(3/7) +4 ] [7(3/7) - 3] = 0
[1.7142... + 4] [ 3 - 3] = 0
[5.7142...] [0] = 0
correct
2007-08-17 09:33:47 · answer #3 · answered by Linda1314 3 · 0⤊ 0⤋
us FOIL to solve this. FOIL means:
multiply the First terms in each set of ()
then, multiply the Outside terms
next, multiply the Inside terms
finally, multiply the Last terms
= 4x(7x) + 4x(-3) 4(7x) + 4(-3)
don't forget to put - signs when needed
multiply out, and combine like terms
2007-08-17 09:29:18 · answer #4 · answered by Jen 3 · 0⤊ 0⤋
To do this question you have to use the FOIL method. This is First Outer Inner Last. You will multiply the first terms, then the outer terms, then the inner terms, then the last terms.
(4x+7)(7x-3)
[(4x)(7x)]+[(-3)(4x)]+[(7x)(7)]+[(7)(-3)]
so you simplify and get...
28x^2+37x-21
2007-08-17 09:30:35 · answer #5 · answered by emmasahottie 3 · 0⤊ 0⤋
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2016-12-13 10:42:12 · answer #6 · answered by Anonymous · 0⤊ 0⤋
=28x^2-12x+28x-12
=28x^2+16x-12
If you're trying to solve, then,
x=-1, or x=3/7
2007-08-17 09:28:13 · answer #7 · answered by de4th 4 · 0⤊ 0⤋
28x^2+16x-12
2007-08-17 09:33:59 · answer #8 · answered by Anonymous · 0⤊ 0⤋
28x^2 + 16x - 12
(Assuming you're after the expanded form...)
2007-08-17 09:27:08 · answer #9 · answered by God 3 · 0⤊ 0⤋
28x^2-12x+28x-12 =28x^2+16x-12
2007-08-17 09:30:36 · answer #10 · answered by Anonymous · 0⤊ 0⤋