Question

Choose the correct product of (7x − 6)2.

49x2 + 84x + 36

49x2 − 36

49x2 + 36

49x2 − 84x + 36

Answer 1

i got 49x^2-36..is that right?

Answer 2

(7x − 6)2. = 7x(7x - 6) - 6(7x - 6)

Answer 3

No its the last one

Answer 4

= 49x^2 - 42x - 42x + 36

Answer 5

how @Ashley1997 ? could one of you show me? please?

Answer 6

can you complete this?

Answer 7

whats -42x - 42x?

Answer 8

I think its the last one

Answer 9

@cwrw238 -84

Answer 10

don't forget the x - its -84x

Answer 11

but where did you get the 42 from...?

Answer 12

have a look at my first post

Answer 13

@zakiaboo That is my best guess. because thats the answer or closest answer

Answer 14

7x * -6 and -6 * 7x

Answer 15

@ceit yes i kno thats the right answer but @cwrw238 is showing me how to do it..so I can learn how to actually do it lol :)

Answer 16

@cwrw238 ohhh so you have to multiply 7*6 first?

Answer 17

@zakiaboo Oh sorry I am learning how to draw things out. I just started here so yeah

Answer 18

Its cool :)

Answer 19

yes 7x( 7x - 6) = 7x*7x + x*-6 = 49x^2 - 42x

Answer 20

hmm okay let me take notes.

Answer 21

a simple example of multiplying 2 binomials is
(x + y)(x + y):

first multiply (x+y) in second bracket by x then by y.
= x(x + y) + y(x + y)
= x^2 + xy + xy + y^2
= x^2 + 2xy + y^2

Answer 22

\[49x^2-84x+36\]\[(-6+7x)^2=(-6+7x)(-6+7x)\]\[-6 (-6+7 x)+7 x (-6+7 x) \] \[-6(-6+7x)+7(-6x+7x^2)\] \[-6(-6)=36 \] \[-6(7)+7(-6)=-84\] \[7(7x^2)=49x^2\] \[formula=ax^2+bx+c\] \[49x^2-84x+36\]